< and > C24 is a receiving three-section 400 pF variable air capacitor with two sections permanently in parallel, the third section is added while in 80 meter band, allowing greater impedance matching on this band. The gold rushes of the 19th century have long since ended, but there are still plenty of places across the US where you can hunt for the precious metal using a shovel, pan, or metal detector. Top Rated Seller Top Rated Seller. So I decided to go for the more common tetrode GU74B/4CX800 which is used in many comercial builds. The 3CX1200D7/YU-121 is a high-mu, forced air cooled, rugged, ceramic/metal tube. 5 KW Output Linear Amplifier w/ 3CX1200A7 on 240V for US. Add to cart:. Enter values in blue and click any Calculate button. IMD's better than 35dB wrt rated output. Plate Line Of The 144 MHz Amplifier With GU74b. temperatures above 1,500 C, the gettering action is reversed. Commander HF-2500 (2x 3cx800's)= 53/56/58/60. This will be a one piece unit with the power supply built in. g the Alpha 91B and the Acom 1000, use GU74 / 4CX800a tubes. DX Engineering GU74B/4CX800A Ceramic Power Tetrodes are high performance ceramic/metal tetrodes with a plate dissipation rating of 800 watts. 8Ft 300 Leds Smd 5050 Rgb Light With 44 10M,New 2018 Led Strip Lights Kit 32. Audience Overlap. Title: RCA 811 tube data sheet Created Date: 11/18/1999 11:54:00 PM. com (800)348-5580 USA & Canada • (630)208-2200 Note: The data supplied in this book is for general reference only. GU-84b is made for bigger anode dissipation and current. Tube - a single 4CX800 (GU74b) grounded cathode, grid-driven, 1000W output all bands. • Tube --fully protected / works into 3:1 mismatch • Tube -inexpensive to replace --$150 for NOS GU74B • Costly, first time investment • Rated 5. It is a 600W dissipation tube and loses emission rapidly when run beyond specs. Featuring: • Power levels up to 250 W to 2. In my opinion these are very conservative values, in fact the tube behaves more like a 800 to 1000W dissipation. * Suitable for either one or two tubes, including 4CX250, 4CX350, 8930, 4CX400, 4CX600, 4CX800, 4CX1000, 4CX1500, 4CX1600A (or 4CX1600U/GS23B, YL1050/2/6 etc. Identical to 4X150D except for heater voltage is 6. Click & Collect. 4cx800 tube. The Acom and the Expert amps are 160 through 6M. My amp is the Dentron MLA-2500 with a pair of 4CX800 Russian tubes. УКВ усилители мощности - просмотр всех схем на qrz. Еmail: owi123 (*)mail. Being sold as used because it was transported back and for and has some scuff marks on it. By the way, I still have the DX 2 amplifier which I am trying to sell for the estate. I came across a site that claims the John Boy Tube Amps are the best quality tube Amps, I'm curious as to what anyone can tell me about these amps as I have never heard of them before period. Trensmitrer coaxial tetrodes RE025XA of czech made (TESLA) - equivalent to 4CX250B or SRL460. EagleMade Products. HF-2500DX running a pair of 4CX800's at the legal limit. This is why the tube has so much gain. We sell NOS (New Old Stock) GU-74b or 4CX800 tubes used in the Acom 2000A, Acom 1000, Acom 1010. Here is the information: 1-866-277-0407 Attn: Amanda C. Tr-PS-3: +/-12Vdc Power Supply. Indeed, as can be seen in the photos, the plastic bag containing the tube is still sealed. 129,90 EUR + 32,69 EUR livraison. The shack was built up in a more comfortable trailer than the times before. I don't think the 539C will handle that. name: 4cx800a svetlana (gu74b). Indeed, as can be seen in the photos, the plastic bag containing the tube is still sealed. or Best Offer. A tetrode with control grid and screen tied together to form a high-μ triode for a grounded-grid circuit makes a very simple arrangement. This will be a one piece unit with the power supply built in. 25 GU 42 50 0. Other readers will always be interested in your opinion of the books you've read. With a DC voltage 0 - 40 V you should be able to get around 400 mA anode current with maximum 40 V DC on the anode. 67 watts, the 50C5 draws 7. 5V on this tube. com Advanced RJ45 LAN Cable tester allows a single person to test several long cables faster and more efficiently than ever before. Fotogalería. amp also has the 10 meter board installed from Original purchase. 8-54 MHz A 1. High power transmitters with lower spec audio requirements are fine, but in my audio gear I am more interested in the latest technology. it 4cx800 4cx800. Call your ACOM dealer! Assuming you have the proper display, after 30-60 seconds press the red ON/OFF button on the front. The tube can stop the flow completely (called cutoff) or let it flow at maximum (called saturation). Although electrically equivalent to the 4CX250B, the base seals must be kept below 175 deg C, whereas on the 4CX250B they are okay to 250 deg C. The primary use is in industrial applications. The Russian VHF tetrode Gu74b (Svetlana 4CX800) is rated 600W anode dissipation on the original datasheet and 800W by Svetlana. ripristinare il coperchio e tutte le connesioni con l’antenna e il RTX. The Tr-PS-3 is a regulated bipolar power supply that puts out +/-12Vdc @ 750mA. The ACOM 1000 HF amplifier is probably the best HF and 6m linear amplifier ever built. It is currently Jun Mon 14, 2021 9:17 am. A Palstar AT-4K tuner touches up the antenna impedance match on band edges. Electron power triode tube 3cx800a7 rf power supply metal ceramic SETEC CX800A7 foam packing. Near the end of World War II , to make radios more rugged, some aircraft and army radios began to integrate the tube envelopes into the radio's molded aluminum or zinc chassis. Audience Overlap. Recommended tubes: 3/4-400 (2), 3-500 (2), 3/4-1000 (1), 3/4CX800 (2), 3CX1500 (1) and certain Russian RF triodes. I choose Czech coaxial ceramic tetrodes RE025XA made in Tesla (equivalent of 4CX250B or SRL460). Bookmark this page This page is full of links that lead to every information page on my web site. The Alpha 8410 utilizes an enhanced version of the RF deck found in the Alpha 99, but instead of the 2 x 4CX800's that have been increasingly difficult to find, our engineers chose Two reasonably priced 4CX1000s. R$ 34,96 de. Alex in Ukraine. Preparing Stored Transmission Tubes for Use after Storage: Comments and Views 3. Add to cart:. Real Grounded-Grid Aplifier. 4CX250B Datasheet RF amplifier up to 175 MHz - Communications & Power Industries, Inc. 4cx800 tube. • A grid overload circuit quickly disables the amplifier if the grid current becomes excessive. 4-125A-4D21. 4CX800 Datasheet, 4CX800 PDF. BLF188XR HF Mosfet 10 - 600MHz 1400 Watt Original AmpleonTechnische Daten: Typ BLF188XRU Gehäuse SOT-539A Hersteller Ampleon Ausführung LDMOS Verst…. Please complete the fields below to send your friend a link to this product. Antique Radio Forums Index » Category » Vintage Communications Receivers and Transmitters. HV4 - 3000VA Ringkern-Transformator. The first commercially made amps using the "new Svetlana 4CX800" were actually using GU74's. Texas Star EIGHT 2sc-2879 Transistors DX 1600 Mobile w/ 4 Fan Kit. Me thinks he's been smoking crack. The shack was built up in a more comfortable trailer than the times before. Quick View. Triode data. Someone please educate me on this particular box as I have no clue. Buy: GU74B, Power Tetrode (equivalent of 4CX800). Featuring: • Power levels up to 250 W to 2. QRO Technologies - Ray Connin KB8VU - Home Page. TUBE IS NOT INCLUDED!. THOMSON 3-500 ZG MATCHED PAIR 4800,00 KR. Calculating Shunt Values. The Alpha 8410 utilizes an enhanced version of the RF deck found in the Alpha 99, but instead of the 2 x 4CX800's that have been increasingly difficult to find, our engineers chose Two reasonably priced 4CX1500Bs. At least there is the Eimac 3CX1200 and. What was the most powerful 11 meter base that you ever heard of ??? I recall back in the early 80's there was a cb station up in michigan that was operating somewhere around 27,000 watts !!!. 00: Sold: Kenwood Speaker SP-940: Good: $100. NEW OLD STOCK. These tubes are delivered to our distributor in massive quantity and have been chosen for applications world wide, which should. Vacuum tube. How Vacuum Tubes Work by Eric Barbour - [Inside a Tube] - [Why are Tubes Still Used] - [Using Tubes] The BASICS. Datasheet search engine for Electronic Components and Semiconductors. !Availability of relatively inexpensive Russian ceramic-metal tetrodes (e. Vacuum Tube GU-74B / 4CX800 / 4CX800A tetrode NEW NOS x 1pc. The performance characteristics of the 4CX800A allow its use as a high gain grid-driven RF amplifier or as used in grounded grid service. 8Ft 300 Leds Smd 5050 Rgb Light With 44 10M,New 2018 Led Strip Lights Kit 32. The difference from say 400 watts out to 200 watts is almost not noticable. I use the 7 elements in Horizontal polarization for DXs,and the Quad for local. 5", the more compact AL-800 uses a single 3CX800A7 to provide 1250 Watts PEP SSB and 850 Watts CW with 85 Watts typical drive level. 7 MHz better than 50dB. The 4CX800 uses a different socket and therefore requires a different mounting scheme requiring serious metal fabrication. Put me on the Waiting List. The reconditioning of a 3-500Z is relatively simple. By using vacuum tubes instead of a mechanical relays computers. As data was collected from a number of sources, Richardson Electronics, Ltd. Think you won't be fined by FCC? Try this one on for size! Before the Federal Communications Commission Washington, D. At least there is the Eimac 3CX1200 and. These tubes are direct replacements for use in some of the best. The 4cx5000a/8170 tube is a compact high slope and when operated under normal conditions, will last a very long time. Postage and payments. Select the Tube Type from the scrolling list. So I decided to go for the more common tetrode GU74B/4CX800 which is used in many comercial builds. With a DC voltage 0 - 40 V you should be able to get around 400 mA anode current with maximum 40 V DC on the anode. 5V on this tube. Vacuum tubes are also used in radio transmitter equipment as well as. With the naming conventions of ceramic tubes, we can tell quite a bit about the unit without even looking at the data sheet. Operating temperature: : –60 ˚С ÷ +100 ˚С. Here is the information: 1-866-277-0407 Attn: Amanda C. T-Network = capacitance 10-800 pF (Q=3000), inductance 30. Схемы и описания трансиверов. This ensures the tube is mostly stabalized thermally before exciting the anode. The following should be direct substitutions. If you look at QST tests of ETO, QRO, and Ameritron amps you will see the 3CX800's in the AL800H greatly surpass the 4CX800's in the other amps for IM3 and IM5. Power Tubes. It has an additional grid called the screen. Class AB1 amplifiers are roughly 60% efficient. 5", the more compact AL-800 uses a single 3CX800A7 to provide 1250 Watts PEP SSB and 850 Watts CW with 85 Watts typical drive level. e-ham Amp Overview AMERITRON ALS-500 Mobile. It is designed around a single Eimac® 3CX800A7 tube, and features dual illuminated cross needle meters, adjustable ALC, a heavy duty power supply with 14 voltage settings from 90-140 and 200-250 VAC, over current protection, step start inrush protection. But at the same time, very few comercial builds use the tube. It is not published anywhere else or recommended by ACOM. No antenna tuner required. • A time-delay circuit provides a 180 second warm-up to eliminate potential damage to the tube cathodes. CPI-Eimac is a leading manufacturer of power grid tubes covering a wide range of applications including broadcast, industrial and scientific. Although electrically equivalent to the 4CX250B, the base seals must be kept below 175 deg C, whereas on the 4CX250B they are okay to 250 deg C. output between the anode and grid is called a grounded-grid amplifier. The pictures here I'm going to post are of the John Boy Tube Amp for the Mobile it says and has 3CX3000 Mobile tube Amp for $4500. Note 1: Definition of PEP: Peak Envelope Power (PEP) is the average power. The "western", "Eniac like" is designation is 4CX800A. Spare Tube for ACOM A2000, A1000 and A1010 (4CX800 Eimac Equivalent) Manufacturer's Website. I have the PHILIPS YD 1130 made at the same time as the first graphite EIMAC 3-500Z used in the SB 220 of 1968-69. The CX800 is a high power subwoofer constructed from 100% void-free Baltic birch, coated in the industry's toughest EXL polyurea finish. 55 kg Filament voltage: 12. TRANSISTOR AMP nach DJ8YP. they won't be compatible. AliExpress carries wide variety of productsCrusher Built 4cx800 tube. Power Transformer: 3+ kVA with strip-wound Hipersil core. Vacum Tube GU-74B / 4CX800 / 4CX800A tetrode NEW NOS x 1pc. Preparing Stored Transmission Tubes for Use after Storage: Comments and Views 3. Feb 1, 2009. 6S33S-V = 6C33C-B Hi-End Amp Triode Tube $28. Near the end of World War II , to make radios more rugged, some aircraft and army radios began to integrate the tube envelopes into the radio's molded aluminum or zinc chassis. But at the same time, very few comercial builds use the tube. 6146 W MATCHED PAIR INCL 12BY7A DRIVER 1100,00 KR. Quick View. For base,I have the M107C from Maco,and I have one Hy Gain Quad Beam. Bottom View. April 19, 2017 · New website is now up and running. So if your voltages are really up as high as your reading I would be concerned. For comparison, the 6L6 heater draws 5. 144 MHz Amplifier Schematic. Fits 3CX800A7, 3CPX800A7, 3CX400A7. Vacuum tubes contain electrodes for controlling electron flow and were used in early computers as a switch or an amplifier. 00 shipping. My amp is the Dentron MLA-2500 with a pair of 4CX800 Russian tubes. Russian military power tetrode tube GU-74B made in USSR and was designed especially for military equipment. RELAY RF CHOKE Temperature Sensor HIGH VOLTAGE POWER SUPPLY Tetrode GU84B (4CX800) CONTROL BOARD TANK COIL, 10-30 m DISPLAY TANK COIL, 40 -160 m POWER ON / OFF BAND SWITCH STANDBY / OPERATE SWITCH BAND SELECTOR PLATE TUNING LOAD TUNING 2 TECHNICAL SPECIFICATIONS FREQUENCY COVERAGE: Complete (manually tuned) coverage of the nine HF amateur bands. TUBE IS NOT INCLUDED!. Frequency Range 1. • ACOM 1000 uses 4CX800 / GU74B Russian tube • Weighs only 50 lbs. RELAY RF CHOKE Temperature Sensor HIGH VOLTAGE POWER SUPPLY Tetrode GU84B (4CX800) CONTROL BOARD TANK COIL, 10-30 m DISPLAY TANK COIL, 40 -160 m POWER ON / OFF BAND SWITCH STANDBY / OPERATE SWITCH BAND SELECTOR PLATE TUNING LOAD TUNING 2 TECHNICAL SPECIFICATIONS FREQUENCY COVERAGE: Complete (manually tuned) coverage of the nine HF amateur bands. Arc Protection. from Russian Federation. £25 (PAIR) plus £6. New 2018 Led Strip Lights Kit 32. 5 200 1 45 220 3. RICHARDSON ELECTRONICS. Davemade amplifiers davemadenj 2sc2879 2sc2290 hg2sc2879 hg2sc2290 toshiba 3-500z 3cx3000a7 3cx10000a7 3cx15000a7 4cx800 cb radio 4cx250b rfjunk. 163,43 EUR + 16,76 EUR. QSK - very quiet vacuum relay. ACOM 1000 HF + 6m Linear Amplifier User's Manual Installation, Operation and Maintenance August 2020 OUTSTANDING HF POWER PRODUCTS. io [mailto: [email protected] Sale 5 pcs. ninaceramiche. An amplifier tube controls the flow of electrons running through it. Fault Protection. This network is slightly more difficult to build than a standard pi network, and requires the use of a two-section switch, but the additional 15 dB of harmonic suppression the pi-L network offers makes the effort worthwhile. Texas Star EIGHT 2sc-2879 Transistors DX 1600 Mobile w/ 4 Fan Kit. new gu74b tube with bigger anode ring we have test this and are warming up this are ready to put into the amplifier. Time Owned: more than 12 months. The '3' in 3CX800 means triode, the '4' in 4CX800 means tetrode -- so. April 20, 2017 · Eaglemade updated their business hours. 03 GU 15 15 0. For base,I have the M107C from Maco,and I have one Hy Gain Quad Beam. THOMSON 3-500 ZG 2395,00 kr. 5 200 1 45 220 3. THIS IS A TRUE 5/8 WAVE FREQ RANGE --- 26 TO 30 MHZ TUNABLE POWER 5KW CARRIER 10KW SSB BANDWIDTH --- 500KHZ WEIGHT --- 20LBS HEIGHT --- 21. 代理出品です。 otk(ロシア) gu74b (寸法資料より4cx800相当品?) 未使用品2本中古2本出品です。(ソケットは中古品に付帯しておりましたので添付致します)掲載真空管詳細を知っておりません。. L’ ACOM1010 come l’ACOM1000 ha una sola valvola o comunemente chiamata “tubo” , la 4cx800A o GU74B (sono identiche). Calculating Shunt Values. QRO Technologies - Ray Connin KB8VU - Home Page. NEW OLD STOCK. 00: Sold: Kenwood TS530S HF Transceiver: Dust Cover, manual: Good: $350. ABER: Ich hatte mal ein Relaisboard testweise fuer ein halbes Jahr in Betrieb, welches nur mit so "richtig billigen" Relais fuer 1-2 DM bestueckt war und es gab waehrend dieser Zeit absolut kein Problem (PA ist ne 4CX1000) Auch ein Kollege von mir hat ne PA mit 2x 4CX800 gebaut und normale Relais vom Conrad eingebaut, das funktioniert seit 1,5. Price - 220 Eur. If it doesn't, something is wrong, and I can't help you. Eimac Transmitting Tube, Tetrode, 4CX125C Ceramic (NOS). 12 GU 63 13 0. This confusion is a clear example of how mixed standards gets us in trouble. Got it for the house so can use when not in the outside shack. GU-84b is made for bigger anode dissipation and current. Triode data. It is a 600W dissipation tube and loses emission rapidly when run beyond specs. EME only HB9CRQ from 1983 to Sept. 4-125A-4D21. amp is 100 % operational i just dont use hf as much as i thought I would so it. Svetlana 4CX800 / GU-74B / GU74B. BTAxx250D Power Wire. About the time I was building my amplifier I had considered buying the Ten Tec amp to save time (contest season was near) but an uncertain delivery time coupled with reports of drifting tuning on 160 (due to output network capacitor. New 2018 Led Strip Lights Kit 32. The amp went back to the shop for diagnosis and repair, and returned with a new 4CX800 tube late the night before Sweeps SSB! Great service from the folks at Array Solutions. W8JI Ham Member QRZ Page. Pair of 3cpx5000 tubes $3500. R$ 196,75 de frete. 4CX800, 4CX1600) offsets additional cost of regulated screen supply, and is driving popularity of moderately-priced grounded-cathode designs. * Suitable for either one or two tubes, including 4CX250, 4CX350, 8930, 4CX400, 4CX600, 4CX800, 4CX1000, 4CX1500, 4CX1600A (or 4CX1600U/GS23B, YL1050/2/6 etc. Cooling: Full-cabinet, ducted forced air using cushion-mounted centrifugal blower. TUBE IS NOT INCLUDED!. it 4cx800 4cx800. The Alpha 8410 utilizes an enhanced version of the RF deck found in the Alpha 99, but instead of the 2 x 4CX800's that have been increasingly difficult to find, our engineers chose Two reasonably priced 4CX1500Bs. Other readers will always be interested in your opinion of the books you've read. 8Ft 300 Leds Smd 5050 Rgb Light With 44 10M. they won't be compatible. 08 November 2014. My amp is the Dentron MLA-2500 with a pair of 4CX800 Russian tubes. All three siblings take the same socket. If you look at QST tests of ETO, QRO, and Ameritron amps you will see the 3CX800's in the AL800H greatly surpass the 4CX800's in the other amps for IM3 and IM5. 00: Sold: Kenwood Speaker SP-940: Good: $100. Shop with confidence. [email protected] Phase Linear 400 Series 1 Amplifier LED Light Upgrade Kit! PL-400 PL 400 Description of Item: This is the premier PL400 LED Lightboard upgrade kit on the web. Class-C Telegraphy or FM Telephony MAXIMUM RATINGS (Key-down conditions, per tube to 110 MHz) 4000 600 350 400 35 10 VOLTS MAXIMUM RATINGS 600. Svetlana 4CX800 / GU-74B / GU74B. I came across a site that claims the John Boy Tube Amps are the best quality tube Amps, I'm curious as to what anyone can tell me about these amps as I have never heard of them before period. 2 years warranty except for tube which comed with a one year warranty. ora spegnete l’amplificatore , staccate la presa d’alimentazione e attendere circa 30 min in modo da far scaricare i condensatori. Which means that whether your antique radio is a cathedral or a console, an Art Deco beauty made of wood or Bakelite, its guts are filled with tubes. 3:1 input VSWR. Price - 220 Eur. TenTec has even discontinued their Titan III amp that used this tube. The first commercially made amps using the "new Svetlana 4CX800" were actually using GU74's. For Sale is my tentec titan lll 417a amp it has low hours on the pair 4cx800 tubes and im the 2nd owner this amp will do legal limit plus with only 30 watts of drive and and is rates For a maximum of 65 watts drive. The primary use is in industrial applications. Tube Interchangability Reference. The tube can stop the flow completely (called cutoff) or let it flow at maximum (called saturation). Similar Sites by Audience Overlap. Triodo di potenza per amplificatori. com Davemadeamps - Cb Radio, Electronics, Cb Radios for Sale. Acom 2000A 2 x 4cx800 amp. 25 GU 42 50 0. HV3 - 3000VA Ringkern-Transformator. HF Lamp, tetrode GU-74b / 4cx800 NOS € 139,00. Marshfield, MO 65706. It is a 600W dissipation tube and loses emission rapidly when run beyond specs. New 2018 Led Strip Lights Kit 32. SPECIAL-TILBUD. Preparing Stored Transmission Tubes for Use after Storage: Comments and Views 3. Name: GU74B / GU-74B = 4CX800 Type: tetrode Cathode type: oxide, indirect heating Application field: power amplification in broadcasting and SSB equipment Brief application: amplification Envelope: metall-ceramic Cooling method: forced air Dimensions: 90mm x 71mm Mass: 0. For the transaction with FedEx, they need your statement with signature for them to deal with me. Matched pair means that they have been selected as two tubes with equal parameters. Tubo de vácuo GU-74B/4CX800/4CX800A tétrodo Novo New Old Stock X 1pc. Tubes: Two Svetlana 4CX800 ceramic-metal tetrodes. ACOM 2000 2001: Short wave linear amplifier 1. NOS tubes have an excellent reputation to use. Title: Getter Materials for Electron Tubes Author: W. Fault Protection. By the way, I still have the DX 2 amplifier which I am trying to sell for the estate. we are a CFA exclusive cattery offering beautiful exotics persians and himalayans. THOMSON 3-500 ZG MATCHED PAIR 4800,00 KR. Pair of 3cpx5000 tubes $3500. I came across a site that claims the John Boy Tube Amps are the best quality tube Amps, I'm curious as to what anyone can tell me about these amps as I have never heard of them before period. 35” Bowtech Diamond “The Edge” compound bow. Техника УКВ - просмотр всех схем на qrz. An amplifier tube controls the flow of electrons running through it. 8Ft 300 Leds Smd 5050 Rgb Light With 44 10M. Tube - a single 4CX800 (GU74b) grounded cathode, grid-driven, 1000W output all bands. 00-$1200 / Piece. Other amps I've used. The three Henry Radio models of 3-500Z amplifiers that run 5. It's certainly better than any others i've used (Ameritron, Ten-Tec, etc. 4-400A-6675. Fixed Price $ 27. GU-84b is the military version of the Svetlana 4CX1600b. THOMSON 3-500 ZG 2395,00 kr. The shack was built up in a more comfortable trailer than the times before. 地上・BS・110度CSデジタルハイビジョン液晶テレビ:th-60cx800n 4kコンテンツの美しさをさらに高める「ヘキサクロマドライブ」&「高輝度ips液晶パネル」 迫力の高音質を実現「ダイナミックサウンドシステム pro」 4kvodサービスなど、多彩な4kコンテンツが楽しめる 番組録画・視聴がさらに手軽に お. The Alpha 8410 utilizes an enhanced version of the RF deck found in the Alpha 99, but instead of the 2 x 4CX800’s that have been increasingly difficult to find, our engineers chose Two reasonably priced 4CX1500Bs. Compatible Brand: Universal. GU-74 B/4CX800 DAGSPRIS. The performance characteristics of the 4CX800A allow its use as a high gain grid-driven RF amplifier or as used in grounded grid service. AL-1200 -- 1. The screen grid is designed to have a high potential applied, on the order of several hundred volts positive. Excluding National Holidays) More stock available week commencing 9/27/21. Vacuum Tube GU-74B / 4CX800 / 4CX800A $159. PHOTO-2 PHOTO-3. Bob Alper The MLA-2500 power amplifiers that are available for purchase have become. ご存知ロシア真空管 4CX800/GU74Bの2本セットです。. Back in 1904, British scientist John Ambrose Fleming first showed his device to convert an alternating current signal into direct current. Let them cook for 1-2 minutes, then apply B+ to the anode and use the tube normally. RELAY RF CHOKE Temperature Sensor HIGH VOLTAGE POWER SUPPLY Tetrode GU84B (4CX800) CONTROL BOARD TANK COIL, 10-30 m DISPLAY TANK COIL, 40 -160 m POWER ON / OFF BAND SWITCH STANDBY / OPERATE SWITCH BAND SELECTOR PLATE TUNING LOAD TUNING 2 TECHNICAL SPECIFICATIONS FREQUENCY COVERAGE: Complete (manually tuned) coverage of the nine HF amateur bands. Garanzia di un anno per difetti di fabbricazione. AliExpress carries wide variety of productsCrusher Built 4cx800 tube. 5751 Jan Ge Nºs valve/tube. 144 MHz Amplifier Schematic. com (800)348-5580 USA & Canada • (630)208-2200 Note: The data supplied in this book is for general reference only. RICHARDSON ELECTRONICS. Phase Linear 400 Series 1 Amplifier LED Light Upgrade Kit! PL-400 PL 400 Description of Item: This is the premier PL400 LED Lightboard upgrade kit on the web. “Regettering” Gu-74b tubes in the Alpha 91 ββββ Amplifier This technique should also apply to the Alpha 99 and possibly Acom amplifiers as well Soviet-made Gu-74b tubes are readily available, but most were constructed sometime deep in the last century. Category: Radio. Vacuum Tube GU-74B / 4CX800 / 4CX800A tetrode NEW NOS x 1pc. MATCHED PAIR 3-500ZG TUBES. 12 GU 63 13 0. jennings 5 465 pf vacuum variable. Vintage Russian Ceramic Socket tubeSOCKET FOR 4CX800A GU-74B DISASSEMBLYGOOD 274252782516. I don't think the 539C will handle that. Gleichrichterröhre G10/1d WF. 4-125A-4D21. Back in 1904, British scientist John Ambrose Fleming first showed his device to convert an alternating current signal into direct current. Featuring: • Power levels up to 250 W to 2. 4cx800 - efk. 00 PLUS JUST TO SHIP TO YOUR DOOR!. 10 watchers. What was the most powerful 11 meter base that you ever heard of ??? I recall back in the early 80's there was a cb station up in michigan that was operating somewhere around 27,000 watts !!!. 2 GU 64 100 0. ACOM and OM power amplifiers. SOME MANUFACTURES MAY OFFER AMPLIFIERS WITH SIMILAR FEATURES FOR A CHEAPER PRICE. Welcome to the EL34 World Tube Amp library of information. Eimac SK1906 air chimney with contact ring SK1916. In this transmitter tubes were extra clamped to socket with two small pieces of a textile adhesive insulators. This network is slightly more difficult to build than a standard pi network, and requires the use of a two-section switch, but the additional 15 dB of harmonic suppression the pi-L network offers makes the effort worthwhile. amp also has the 10 meter board installed from Original purchase. Texas Star EIGHT 2sc-2879 Transistors DX 1600 Mobile w/ 4 Fan Kit. It is no doubt a powerful and cheap triode. Eimac SK-406 Chimney. The Russian VHF tetrode Gu74b (Svetlana 4CX800) is rated 600W anode dissipation on the original datasheet and 800W by Svetlana. All tubes before shipping we check on a test stand. FidgetKute Pair Ceramic Sockets SK2A for 3CX300 4CX400 4CX800 GU74B GS36B GU70B GU108B GM5B Show One Size: Amazon. Vacum Tube GU-74B / 4CX800 / 4CX800A tetrode NEW NOS x 1pc. Tube - a single 4CX800 (GU74b) grounded cathode, grid-driven, 1000W output all bands. High power transmitters with lower spec audio requirements are fine, but in my audio gear I am more interested in the latest technology. HV1 - 1800VA Gleichrichterrö HV4 - 3000VA HV2 - 800VA HF MOSFET HV3 - 3000VA. 419,00 € *. Pair of 4CX800 Tubes: Shipping date on box July 2014 from Ukraine, numbers on top of tubes 1698-9 and 1699-9: NOS: $300. It is a professional-class upgrade product, meticulously engineered to look and perform better than the original. The horizontal fins used on these tubes result in a ligher and. Often amplifiers apply automatically HV and. Let them cook for 1-2 minutes, then apply B+ to the anode and use the tube normally. AL-1200 -- 1. Two 4CX800 Svetlana tetrodes. 50-54 MHz better than 60dB. true even when the amplifier does not have a directly grounded grid. The PCB-mount power transformer is the same one used in the Tr-PS-1, a MagneTek FS24-1500. Vacuum tubes contain electrodes for controlling electron flow and were used in early computers as a switch or an amplifier. Ordering a matched pair of GU74b / 4CX800. 1 = 44mA C Multiply B by number of tubes 44 x 2 = 88mA D Round C upward to the next multiple of 10mA 88 rounds up to 90mA Design for this amount of trip. Often amplifiers apply automatically HV and. GU-74B NOS 4CX800A NOS Tube GU74B with BOX. Triode data. I read the 4CX800A/GU74B tube is no longer in production. SPECIAL-TILBUD. 3 phase bridge. By using vacuum tubes instead of a mechanical relays computers. + 220 pF fixed / 5 KV & 1000 pF var. C'est pourquoi, lors de ces prochains concours majeurs, je vais peut-être m'inscrire en "low power", car l'utilisation de l'ACOM 1000 et de sa 4CX800 (800W) me fait passer pour un "tout petit" ! HI. Compatible Brand: Universal. The originals of the vacuum tube, or valve as it's called in. • 160 thru 6 meters / 1000 Watts output @ 230 VAC. 4cx800 - dndi. 8Ft 300 Leds Smd 5050 Rgb Light With 44 10M,New 2018 Led Strip Lights Kit 32. THOMSON 3-500 ZG MATCHED PAIR 4800,00 KR. (4CX800) 7 2 TECHNICAL SPECIFICATIONS FREQUENCY COVERAGE: Complete (manually tuned) coverage of the nine HF amateur bands: 1. Pair of 3cpx5000 tubes $3500. GU74B / 4CX800A / GU-74B / 4CX800 Ceramic Socket USSR DISMANTLING Lot 1pcs. The computer screen and keyboard at the center of the console handle logging and other data tasks. ora spegnete l’amplificatore , staccate la presa d’alimentazione e attendere circa 30 min in modo da far scaricare i condensatori. 00: Sold: Kessler Engineering Palstar AT-AUTO HF Tuner: Dust Cover, manual: Excellent: $750. 4 TUBE 4CX800 SOLD. It seems that the exchange of GU74b / 4CX800 tubes in Amplifiers like Alpha91b, Acom2000A, and Acom1000 is more interested than originally expected. It's certainly better than any others i've used (Ameritron, Ten-Tec, etc. Other readers will always be interested in your opinion of the books you've read. Taken from the working Russian military transmitter used 4CX800 (Gu74B). io [mailto: [email protected] 真空管 4CX800/GU74B 2本 新品. new gu74b tube with bigger anode ring we have test this and are warming up this are ready to put into the amplifier. I suspended the testing after 17 meters. All three siblings take the same socket. 5 kW • Air, liquid, and conduction cooling. It is useful at full ratings through 250MHz. CPI-Eimac is a leading manufacturer of power grid tubes covering a wide range of applications including broadcast, industrial and scientific. 5V on this tube. Ameritron AL-800H Linear Amplifiers produce 1,500 watts output for operations from 160 through 15 meters**. 729 Initials; 94 DXCC (DXCC #5 1994) 58 Main Squares; 395 Grid Squares; 50 states of USA (WAS #136 1994). I use the 7 elements in Horizontal polarization for DXs,and the Quad for local. NOS (New Old Stock) We sell NOS (New Old Stock) GU-74b or 4CX800 tubes used in the Acom 2000A, Acom 1000, Acom 1010. The SK-1A has a built-in annular screen , 4CX800A High Perform ance Tetrode he Svetlana 4CX800A is a highperformance ceramic metal tetrode , of the 4CX800A allow its use as a high gain griddriven RF amplifier or in grounded grid service. 7 MHz better than 50dB. Located near Springfield Mo. Amplifier Repair, Maintenance and Test Service. It is absolutely important to replace the tubes with a matched pair. The ACOM 2000A is the first teur HF. Fault Protection. 5 GU 29 40 0. 00 PLUS JUST TO SHIP TO YOUR. HF MOSFET Ampleon BLF188XR. Delivery time is around 5 to 10 days. GU74B / GU 74B / GU-74B / 4CX800 Pair Socket Military USSR GreatCondition - $193. Amplifiers Röhre GU-74b, NOS- „neu aus altem Lagerbestand“, unbenutzt. Conditioning GU74b / 4CX800A transmitting tubes before installation April 2012. Bookmark this page This page is full of links that lead to every information page on my web site. 811 A 4 MATCHED 1900,00 KR. 50V- BLF188XR LDMOS BASE - INDESTRUCTIBLE! 110/220. Hence I’ve been thinking about the 3501A and its GU78b. 2 (=4CX800) GU 81 450 0. Sitter iAlpha eller Acom och fås ibland för bara c:à 500 spänn på eBay som kan varanågot riskfyllt med osäker kvalité. GU74B / 4CX800A / GU-74B / 4CX800 Ceramic Socket USSR DISMANTLING Lot 1pcs. 4-400A-6675. It's a cute little thing. I use an amplifier with a pair. This technique is termed the "oscilloscope transfer method". The pictures here I'm going to post are of the John Boy Tube Amp for the Mobile it says and has 3CX3000 Mobile tube Amp for $4500. Would you be so kind as to post the pictures of the 4CX800 tube with the bent pins and the emails that were sent by each of you? Since the pins are only. 'Universal' power and control unit for almost any tetrode PA. The Alpha 8410 utilizes an enhanced version of the RF deck found in the Alpha 99, but instead of the 2 x 4CX800’s that have been increasingly difficult to find, our engineers chose Two reasonably priced 4CX1000s. Marshfield, MO 65706. 8Ft 300 Leds Smd 5050 Rgb Light With 44 10M,New 2018 Led Strip Lights Kit 32. com Free Ham Radio Classified Ads from QTH. Got it for the house so can use when not in the outside shack. The "western", "Eniac like" is designation is 4CX800A. For Sale is my tentec titan lll 417a amp it has low hours on the pair 4cx800 tubes and im the 2nd owner this amp will do legal limit plus with only 30 watts of drive and and is rates For a maximum of 65 watts drive. The first commercially made amps using the "new Svetlana 4CX800" were actually using GU74's. The control grid connection to ground will. 96 Original Price $183. En el, se produce el efecto de la emisión de los electrones por medio del calentamiento y la particularidad de algunos metales de ser termo emisores de electrones. Antique Radio Forums Index » Category » Vintage Communications Receivers and Transmitters. or Best Offer. 10DX8 10E/770. Before I could start on the 4CX800 project, I discovered some triodes designated GI-7B (350 watts dissipation each and hi-mu) that had a possibility of fitting into the available space in the RF compartment of the QRO. 4CX800 is an external anode tube of this sort. TUBE IS NOT INCLUDED!. C24 is a receiving three-section 400 pF variable air capacitor with two sections permanently in parallel, the third section is added while in 80 meter band, allowing greater impedance matching on this band. • Tube --fully protected / works into 3:1 mismatch • Tube -inexpensive to replace --$150 for NOS GU74B • Costly, first time investment • Rated 5. 代理出品です。 otk(ロシア) gu74b (寸法資料より4cx800相当品?) 未使用品2本中古2本出品です。(ソケットは中古品に付帯しておりましたので添付致します)掲載真空管詳細を知っておりません。. The 800W is a fraud. The GU-74b is fully equivalent to the modern 4CX800A tube. g the Alpha 91B and the Acom 1000, use GU74 / 4CX800a tubes. To performe ionization current test we do what is called "gettering" or preconditionong procedures. "You measure the output transformer's voltage drop and. Find many great new & used options and get the best deals for Gu-74b Gu74b Tube NOS 4cx800 Tubes at the best online prices at eBay! Free delivery for many products!. RU Russian hamradio site. A Palstar AT-4K tuner touches up the antenna impedance match on band edges. 8Ft 300 Leds Smd 5050 Rgb Light With 44 10M,New 2018 Led Strip Lights Kit 32. Operating temperature: : –60 ˚С ÷ +100 ˚С. #19 rustyhyde427, Nov 18, 2014. from Russian Federation. 4-year Alpha Radio Products limited warranty. Enter values in blue and click any Calculate button. This is a 7-pin socket made of high quality dielectric. The anodes of my YD 1130 look exactly the. A Palstar AT-4K tuner touches up the antenna impedance match on band edges. You previously purchased this product. com davemadeamps. If it doesn't, something is wrong, and I can't help you. Tube is NEW, NOS and never used before!. GU-74B NOS 4CX800A NOS Tube GU74B with BOX. 真空管 4CX800/GU74B 2本 新品. // depends on filament potential. Sorry we do not endorse PRC final amplifier tubes, EL34, EL506 or 811A. delta ec1 dynamic mic amplifier / echo chamber w/ roger beep 4 pin cobra cb. name: 4cx800a svetlana (gu74b). UTILIZE THE TOSHIBA TRANSISTORS WHILE THEY ARE STILL AVAILABLE. It is currently Jun Mon 14, 2021 9:11 am. 2 (=4CX800) GU 81 450 0. Anode cap for 4cx800-This anode cap fits 4cx800. "Bob" Alper, W6KT Article as first appeared in Communications Quarterly magazine, Summer 1996. It seems that the exchange of GU74b / 4CX800 tubes in Amplifiers like Alpha91b, Acom2000A, and Acom1000 is more interested than originally expected. The three Henry Radio models of 3-500Z amplifiers that run 5. The Acom and the Expert amps are 160 through 6M. I choose Czech coaxial ceramic tetrodes RE025XA made in Tesla (equivalent of 4CX250B or SRL460). Tubo de vácuo GU-74B/4CX800/4CX800A tétrodo Novo New Old Stock X 1pc. These tubes were manufactured in the tens of thousands in the mid to late 20th Century, so all those available in 2012 are N. Datasheet search engine for Electronic Components and Semiconductors. We provide service and support for all amplifiers we have sold! Accesories. 35” Bowtech Diamond “The Edge” compound bow. The '3' in 3CX800 means triode, the '4' in 4CX800 means tetrode -- so. This liner can be made out of clay tiles, aluminum / stainless steel tubing, or a cast-in-place material similar to cement or concrete. Thanks again, Jim WD5JKO Jim, Bob Schetgen, KU7G machined that Teflon block in the 4CX800 article. The first commercially made amps using the "new Svetlana 4CX800" were actually using GU74's. Tube is NEW, NOS and never used before!. Electron power triode tube 3cx800a7 rf power supply metal ceramic SETEC CX800A7 foam packing. Acom 1000 (Gu74b/4cx800) = 44/55/55/60 " "Ameritron AL-82 (2x 3-500z's) = 38/54/53/53 (typ up to 3:1 SWR) Ameritron AL-811 (3x 811a's) = 40/46/56/58. 4cx800 - efk. GU74B / 4CX800A / GU-74B / 4CX800 Ceramic Socket USSR DISMANTLING Lot 1pcs. 8Ft 300 Leds Smd 5050 Rgb Light With 44 10M 100% safe online checkout Makes Shopping Easy The latest design style Buy online or. it 4cx800. 新品未開封ですがノークレームでお願いします。. GU 74b Acom amplifier tetrode 4CX800/GU74b tube for Acom 2000A, Acom 1000, Acom 1010. The Russian VHF tetrode Gu74b (Svetlana 4CX800) is rated 600W anode dissipation on the original datasheet and 800W by Svetlana. Alex in Ukraine. One nice aspect about building a preamplifier from a kit is that you can change what you don't like. The GU-74B is a decent tube at its original Russian specs but the 4CX800A version is a complete fraud. 4cx800 - efk. 57 shipping. C24 is a receiving three-section 400 pF variable air capacitor with two sections permanently in parallel, the third section is added while in 80 meter band, allowing greater impedance matching on this band. 4CX800A High Performance Tetrode he Svetlana 4CX800A is a high- performance ceramic metal tetrode with a plate dissipation rating of 800 watts with forced air cooling. Marshfield, MO 65706. With a DC voltage 0 - 40 V you should be able to get around 400 mA anode current with maximum 40 V DC on the anode. One nice aspect about building a preamplifier from a kit is that you can change what you don’t like. 53" inside diameter, 1-1/4" high. For Sale is my tentec titan lll 417a amp it has low hours on the pair 4cx800 tubes and im the 2nd owner this amp will do legal limit plus with only 30 watts of drive and and is rates For a maximum of 65 watts drive. 4CX800 parts. The first Svetlana 4CX800 data sheet stated that this tube is the same as the GU74 widely used in the Eastern Europe. Eimac SK-406 Chimney. 4 industrial. AliExpress carries wide variety of productsCrusher Built 4cx800 tube. 2 GU 64 100 0. 4cx800 tube. L’ ACOM1010 come l’ACOM1000 ha una sola valvola o comunemente chiamata “tubo” , la 4cx800A o GU74B (sono identiche). 811A 3 STK MATCH 1425,00 KR. I don't think the 539C will handle that. 00 shipping + $39. At least there is the Eimac 3CX1200 and. The 4CX800 (GU74B) is a very good valve, cheap when you're looking to amp's with 3-500Z valves in it. Garanzia di un anno per difetti di fabbricazione. Picked up a 2nd FT101E with an AM filter and did Tim's audio mods. FidgetKute Pair Ceramic Sockets SK2A for 3CX300 4CX400 4CX800 GU74B GS36B GU70B GU108B GM5B Show One Size: Amazon. 新品未開封ですがノークレームでお願いします。. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features Press Copyright Contact us Creators. We have a tubes in the original packaging and without it. 00 shipping. 9 FEET WIND RATING --- 100MPH MAST SIZE --- UP TO 1 5/8. Irgendwann steht ein Röhrenwechsel an, bei dem folgendes beachtet werden sollte: Die NOS-Röhren stammen meistens aus russischen, militärischen Ersatzteil-. Bookmark this page This page is full of links that lead to every information page on my web site. Dentron MLA-2500 4cx800 Signature Series Amateur Radio Dust Cover New. SV: [AMPS] 4CX800's vs 4CX1600. Thanks for dope Rich - very interesting. 00: Sold: Kessler Engineering Palstar AT-AUTO HF Tuner: Dust Cover, manual: Excellent: $750. I was going to sell it as/is for a good price. Ne ho una coppia Euro 160 valvola + zoccolo compresa spedizione , la coppia euro 300 compresa spedizione. So I decided to go for the more common tetrode GU74B/4CX800 which is used in many comercial builds. linear amplifier hf vhf home made with 4cx800 gu74b gu78b 3cx1200 3cx1200a7 8877 3cx1500 4cx250 4cx15000a gu36b. These tubes are direct replacements for use in some of the best. New 2018 Led Strip Lights Kit 32. Near the end of World War II , to make radios more rugged, some aircraft and army radios began to integrate the tube envelopes into the radio's molded aluminum or zinc chassis. Name: GU74B / GU-74B = 4CX800 Type: tetrode Cathode type: oxide, indirect heating Application field: power amplification in broadcasting and SSB equipment Brief application: amplification Envelope: metall-ceramic Cooling method: forced air Dimensions: 90mm x 71mm Mass: 0. RELAY RF CHOKE Temperature Sensor HIGH VOLTAGE POWER SUPPLY Tetrode GU84B (4CX800) CONTROL BOARD TANK COIL, 10-30 m DISPLAY TANK COIL, 40 -160 m POWER ON / OFF BAND SWITCH STANDBY / OPERATE SWITCH BAND SELECTOR PLATE TUNING LOAD TUNING 2 TECHNICAL SPECIFICATIONS FREQUENCY COVERAGE: Complete (manually tuned) coverage of the nine HF amateur bands. This technique is termed the "oscilloscope transfer method". (4CX800) 7 2 TECHNICAL SPECIFICATIONS FREQUENCY COVERAGE: Complete (manually tuned) coverage of the nine HF amateur bands: 1. GU74b / ГУ-74b / 4CX800 Tetrode. 163 163 x gezien 0 0 x bewaard sinds 20 feb. NOS (New Old Stock) We sell NOS (New Old Stock) GU-74b or 4CX800 tubes used in the Acom 2000A, Acom 1000, Acom 1010. For base,I have the M107C from Maco,and I have one Hy Gain Quad Beam. !Availability of relatively inexpensive Russian ceramic-metal tetrodes (e. My amp is the Dentron MLA-2500 with a pair of 4CX800 Russian tubes. Time Owned: more than 12 months. 1: Two well-used 4CX5000A tubes, one with its bottom concentric contact rings showing.