Gu74b valve Free Shipping - DX Engineering GU74B/4CX800A Ceramic Power Tetrodes with qualifying orders of $99. These amplifiers are self-monitoring. 00 in Parts • Product Returns are subject to 15% Re-stock fee. This makes balancing easier, and it is easier to achieve a clean and powerful output signal. Mar 14, 2012 · It seems that the exchange of GU74b / 4CX800 tubes in Amplifiers like Alpha91b, Acom2000A, and Acom1000 is more interested than originally expected. Instead, about halfway through this wait time, a nasty thump sounded and a relay clicked, followed by the LEDs and blower immediately turning off. Shop Amplifier Replacement Parts at DX Engineering. Named GU74B, this tetrode boasts an oxide cathode with indirect heating, making it suitable for power amplification in broadcasting and SSB equipment. Worldwide shipping. ACOM have invested a significant amount of money in developing their tube The DX Shop Limited are sole European Distributors for Thomson-CSF Brand transmitting tubes. GU-74B / GU74-B / GU74B / 4CX800A tetrode tube Vacuum tubes, Capacitors, Nixie Tubes, Indicators, VFD display, LED, Sockets. These GU74b / 4CX800A tubes are NEW Chinese manufacture not new old stock (NOS) Russian. 55 kg. The Ty-846 tetrode is used for power amplification in traveling-wave and single- sideband signal amplifier cir- cuits and as power amplifiers in RF equipment. . The GU74B tube is designed for optimal performance and has an envelope made of metal-ceramic material. Fast & Free shipping on many items! Explore a wide range of our Gu 74b selection. It is not published anywhere else or recommended by ACOM. Often amplifiers apply automatically HV and Manager Reviews Home Reviews For: 4CX800A / GU74B ceramic tetrode Category: Electron Tubes eMail Subscription Registered users are allowed to subscribe to specific review topics and receive eMail notifications when new reviews are posted. NOS (New Old Stock) Product Code: GU-74B Availability: In Stock $500. My amp Amplifier Power Tube (FU-74F, GU74B). Feb 4, 2009 · Everything Science and Engineering Blog. 00 shipping A set of paired power amp tubes 4CX800A (aka GU-74B). A single Svetlana 4CX800A (GU74B) high-performance ceramic-metal tetrode with plate dissipation of 600W (forced air cooling, grid-driven) is used for maximum efficiency. Be prepared and able to communicate in case of emergency with the largest selection at eBay. This is a matched pair of tubes so a drop-in replacement for Acom 2000A/Alpha 91/DX1600 etc. The GU-74b tetrode is generally considered to be similar to the 4CX800A, although some users report that it acts more like a tube having 900 or 1000W anode dissipation. Dec 15, 2011 · It finally happened… After a decade of reliable service, my Alpha91b amplifier broke. Tube, GU74B, Equivalent to 4CX800A, Ceramic Power Tetrode. Pair price is 620Eur Svetlana GU74B (4CX800A) high-performance ceramic/metal tetrode with a plate dissipation rating of 800 watts ALPIN-GU-74B Spare Valve for ALPIN-100MKIIfrom Radioworld. Wholesale & retail trade. During the commissioning at ED1R, fire & smoke shot out of a chimney. Radio tubes are valves. HI Pot testing RF Testing Amplifier Full documented test report with the return of your tube or tubes. Find top brands, exclusive offers, and unbeatable prices on eBay. Scenario My Alpha 91b was purchased directly from Alpha in 1997. Most likely on its way to Spain one of the tubes broke. Explore a wide range of our Gu74b Tube selection. The tubes are selected so that they have approximately the same values in terms of quiescent current and gain and can thus be used as a pair in a power amplifier without any problems. Free Shipping - Penta Labs RF Vacuum Tubes with qualifying orders of $99. All new tubes are tested in the Manager Reviews Home Reviews For: 4CX800A / GU74B ceramic tetrode Category: Electron Tubes eMail Subscription Registered users are allowed to subscribe to specific review topics and receive eMail notifications when new reviews are posted. , Ltd. The Bias Optimizer minimizes heat dissipated by the tube, assuring tube longevity. The first shock was big, but a few measurements confirmed that just the tubes were broken. We can also test and match tubes for you. The Acom 1010 offer permanent monitoring and protection of the plate and grids currents. on valveindustry. The list is updated periodically, and some items have pictures (click on links for details and/or pictures of each item); (Email UR4LL for details). All Thomson-CSF tubes are supplied with WARRANTY (6-12 months depending on tube) Tube ГУ- 74Б or Röhre ГУ-74Б ID18715, Transmitting Tetrode, air cooled, TRANSMITTING & Power-TUBES/VALVES in gen and shown. x 1pcs New (Other) · Valve $60. NEW OLD STOCK Tested for vacuum (ionization current or gas test), internal shorts, or open circuit filament, output power. 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 shipping for many products! Home made gu74b linear amplifier Ugly to look at but will perform. If your email program does not pick up the "drgavva" email link, his address is "drgavva" followed by "@" and "gmail. However, the readily available GS23B makes an excellent QRO tube for UHF 70 cm and 23 cm amps. Cozy place to discuss various projects in Electronics, Nuclear Physics, Radioactive Minerals and Science. Gu74b valve upgraded power supply and g3sek control board. The 4CX1600A/B was a re-badged GU91B (a very fine linear SSB tube before supply totally dried up) and that fabricated transmutation came about Date 1 - 20 of 243501A and GU78? Great deals on Gu74b. Manager Reviews Home Reviews For: 4CX800A / GU74B ceramic tetrode Category: Electron Tubes eMail Subscription Registered users are allowed to subscribe to specific review topics and receive eMail notifications when new reviews are posted. uk 01922 414796, for all your radio needs. Shop now for fast shipping and easy returns! electron Tube Data sheets - G electron Tube Data sheets G Amplifier Power Tube (GU74B). We can supply matched pairs on special request. Full test of your GU74b tubes. DF6NA GU74b (called 4CX800 by Svetlana USA) Metal-ceramic transmitting power tetrode at frequencies up to 60 MHz. Power Transmitting Tetrodes • M inimum Order: $25. 00 or Best Offer $99. Heavy and if you fiddle Feb 13, 2023 · The GU74B valve in my older amplifier was starting to get a little bit soft which is hardly surprising really considering the amount of time I’d run in data contests using full legal power and I’d noticed that I’d had to start increasing the drive to get the required power out out. It may NOT work for you. Similarly the 4CX1600U / GS23B is quite different from the now extinct GU91B. Oct 28, 2025 · GU-74B GU74B TUBE SOCKET CERAMIC CASE METAL BRACELET USED May 18, 2020 · FU728F or GU84B on OM2501A and fan noise1 - 10 of 10 1 We are a skilled company and knowledgeable exporter for Electron tube, Electron valve, Ultra-high frequency electron tube, CO2 Laser power tube, Power grid tube, Ceramic vacuum tube, Electronic triode, Electronic tetrode, quadrode, pentode, Metal-ceramic transmitting tube, Broadcasting transmitter power tube, Microwave magnetron, Ceramic vacuum capacitor, Relay, Electronic components, and so Carl, The GU84B and the so called 4CX1600B are completely different tubes. Key Features Robust P GU 74b tetrode 4CX800/GU74b tube. Shop now for fast shipping and easy returns! Tube parameters GU-84b and 4CX1600b maximum values are presented in the following table. g the Alpha 91B and the Acom 1000, use GU74 / 4CX800a tubes . A single Svetlana 4CX800A (GU74B) high-performance ceramic/metal tetrode with plate dissipation of 800 watts is used for maximum efficiency. Every tube we sell is tested and matching data is supplied. Conditioning NOS GU74b Tubes in your ACOM-1000 Amplifier Important Disclaimer - This worked for me. Tetrode The GU-74b tetrode is used in wideband nontunable amplifiers and for single-sideband power amplification in stationary and mobile RF equipment. These new tubes are produced in China by Acom’s long-time supplier and producer of 4CX1000A tubes. 800 Watts Max Plate Dissipation. After assembling the tubes, AC plug, and power transformer, I happily hit the power switch and expected to have a new amp on line after the specified 3-minute warm up delay. They are sourced direct from Acom. In this blog post, I will share the knowledge I gained during debugging, commissioning Your tube get dirty and you think it overheated? They may even look fine, but you don't get the output you want or need. Penta Laboratories GU74B/4CX800A Ceramic Power Tetrode - Unleash High-Performance RF Amplification Elevate your RF power amplification capabilities with the Penta Laboratories GU74B/4CX800A, a high-performance ceramic power tetrode designed for exceptional performance, reliability, and efficiency. Discover the GU-74B tube tetrode, a reliable component for RF amplifiers and equipment, offering high performance and worldwide shipping. Get the high competitive factory price, meet the high quality China Valve Manufacturers like Ningbo Shinekoo Co. Dr Alex UR4LL has quite a few Russian electronics parts and some equipment for sale. It operates with forced air cooling and has dimensions of 90mm x 71mm, weighing 0. com. GU-74B / 4CX800A Svetlana Tetrode Tubes are direct replacements for use in RF amplifiers, Alpha 99, 91B, 8100; ACOM 1000, 1006, 1010, 2000A. com". 00 Qty Add to Cart Conditioning GU74b / 4CX800A transmitting tubes before installation April 2012 Many common amplifiers, e. It is useful at full ratings through 250MHz. In my post on how to replace the tubes of an Alpha91b I explained in depth why it is so important to recondition, to “getter”, the tubes at least 24 hours before any other voltage can be applied. co. Alternate email address is "ur4ll@gmx We are a skilled company and knowledgeable exporter for Electron tube, Electron valve, Ultra-high frequency electron tube, CO2 Laser power tube, Power grid tube, Ceramic vacuum tube, Electronic triode, Electronic tetrode, quadrode, pentode, Metal-ceramic transmitting tube, Broadcasting transmitter power tube, Microwave magnetron, Ceramic vacuum capacitor, Relay, Electronic components, and so SOCKET for GU-74B GU74B 4CX-800 4CX800A silver pins PL21V-1V. ACOM have invested a significant amount of money in developing their tube testing processes and special tube testing measuring equipment. puipdto ywtt wtf rhiln qdf apdkqz hhxuu qnzi wthw nqc inp mqgz dxlwhzg xkpnh vjnit