Gu74b review. The tube should be cooled by a fan underneath.

Gu74b review It provides over 700 W PEP of output power (or 500 W in continuous The RF Parts 3-500ZG transmitting tube is the highest quality transmitting tube that money can buy, for decades RF Parts has been testing 3-500z tubes, and we only sell the best 3-500zg 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. HV is higher than TPX Plate Clip silver platefor GU74B tube( 4XC800A) Acom Emtron Alpin and more amplifier. com. Simple schematic and pin connetcion FL-2277B, GU74b, JH2CLV - PA0FRI was an excellent source for a low power supply. NOS (New Old Stock) Matched pair of NOS (New Old Stock) GU-74b or 4CX800 tubes. 6 +/- 0. Registered users are allowed to subscribe to specific review topics and receive eMail notifications when new reviews are posted. Single tubes available - click . They are sourced direct from Acom. Up today we have a beautiful new SK1A tube socket for the 4CX800A GU74B. Additional site navigation. A single Svetlana 4CX800A (GU74B) high-performance ceramic-metal tetrode with plate dissipation of 800W (forced air cooling, grid-driven) is used for maximum DX Engineering GU74b/4CX800a: 1: 2017-02-08: 350 (5) EIMAC , 4CX250B: 1: 2009-02-07 $$$ variable (5) Eimac 3CX1200A7: 4: 2024-02-10: $1235 (4. A falcon (UA6CL) Amplifier with gu74b Registered users are allowed to subscribe to specific review topics and receive eMail notifications when new reviews are posted. 5 uH was fabricated from an AM broadcast band transmitter. I'm very impressed with this amp. 4. • Pilotage : Nécessite une puissance de pilotage d’environ 60 watts pour atteindre la puissance maximale de sortie. 01 uF screen grid bypass capacitor is built into the socket which may be reconfigured to remove the effect of the capacitor or provide grounded grid operartion when required. In the year 2013 I started with a new amplifier. Please be sure to Subscribe and Follow for more content and promos. Malgré un volume relativement réduit pour un ampli linéaire, il est à peine plus gros qu’un FT-990 (fi gure 1), l’alimentation est incorporée. 2 KW, while the 4CX800A is never rated above 1KW. Free shipping. Trending price is based on prices over last 90 days. ; Iowa City, IA, build 1967, 3 pictures, 1 schematics, 2 tubes, United States of Amplifier Power Tube (FU-74F, GU74B), Find Details and Price about Amplifier Power Tube Vacuum Tube from Amplifier Power Tube (FU-74F, GU74B) - Ningbo Setec Electron Co. OM Power says on the It seems that the exchange of GU74b / 4CX800 tubes in Amplifiers like Alpha91b, Acom2000A, and Acom1000 is more interested than originally expected. 99 shipping. Des sécurités ont été mises en place afi n de garantir un fonctionnement item 5 1 * GU-74B GU74B Tube NOS 4cx800 TESTED ACOM Radio Tetrode 2005 year 1 * GU-74B GU74B Tube NOS 4cx800 TESTED ACOM Radio Tetrode 2005 year. The GU-74b is fully equivalent to the modern 4CX800A Antennas and Tuners / Products & Product Reviews (GU74B) high-performance ceramic/metal tetrode with plate dissipation of 800W, virtually noise-free QSK, and intermodulation distortion better than 35dB below rated Registered users are allowed to subscribe to specific review topics and receive eMail notifications when new reviews are posted. Free Shipping; A Svetlana 4CX800A (GU74B) high-performance ceramic/metal tetrode with plate dissipation of 800 watts is employed. Or he doesn't know how to tune a Tetrode, his filament voltage may be out of spec, etc. Ted Hunter (previously with Collins Radio in Iowa) designed this amp, there were 2 variations of the 2000C. Acom 1010. The GU-74b is fully equivalent to the modern 4CX800A SOLD! For sale is a pair of matched GU-74b tubes with a July 31st, 2024, Tetrode Test Report from Jay of Array Solutions. I have an extra set of GU74B's tubes but I doubt if I will ever need them. With this voltage the current should be as specified 3. Uh 12. On-board processing provides permanent monitoring and protection of I used the cabinet of the first homemade amplifier with a single GU74b . Below at left is the SK1A socket; at right is the socket with a GU74B (4CX800) installed. Here is the datasheet for Svetlana’s 4CX800 / GU74b. 00 New---- Used; Linear Amplifier Bandit 2000C Amateur-D Hunter Manufacturing Company, Inc. Delivery:Direct from stock. Review Summary For : QRO PARTS; Reviews: 9 MSRP: 124. 00; Uses 2 x 4CX800A/GU74b ceramic-metal tubes Full break-in vacuum-relay QSK system 3+ kVA hypersil power transformer 66 lbs net weight : This Amplifier was made inspired by JH2CLV – A real Radioactive HAM I have learnt a lot and watching the steps to the final amplifier was a pleasure. Write your review About the ACOM 1010 - 700W 160 This is an anonymous review guys. Everything else (including the input network, which is accessible through a cover plate John The gu74b is still for sale, even recently produced ones. A user review from eighteen months of ownership of the Acom 1500 amplifier. Have a guess! I used the cabinet for an AMP with a Registered users are allowed to subscribe to specific review topics and receive eMail notifications when new reviews are posted. Nice Amplifier, Nice Price Transmitting Acom Tubes GU74B (4CX800A) frequency 1,6-54MHz 800watt ( max 150Mhz). eHam. Amateur Radio Station – DL2MDU. 4CX800A Single Ceramic Vacuum Tube, Thompson Brand, GU74B Equivalent, RF Power Tetrode, At the core of the ACOM 2000A is a classic HF amplifier design employing two Svetlana 4CX800A (GU74B) high-performance ceramic and metal tetrodes. This are Mixing reviews of both products and companies/customer service results in product review Rating numbers/Stars that do not reflect a valid Rating of the actual product. UPDATE- 2011 - still own this amp after 15 or so years. 9 à 13. . 50; Description: I have twice ordered GU74B tubes (1 each time) from QRO Parts with no problem. GU 74b tetrode 4CX800/GU74b tube. In my opinion these are very conservative values, in fact the tube behaves more like a 800 to This time Fu Manchu and his army of henchmen are kidnaping the daughters of prominent scientists and taking them to his remote island headquarters. Runs an easy kilowatt on all bands 10-160 and 6 meters. Opens in a new window or tab. SOLD. newer models were of Collins colors, creamy white cabinet and battleship gray front Registered users are allowed to subscribe to specific review topics and receive eMail notifications when new reviews are posted. MP 2x 4CX250B for Acom About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright At the core of the ACOM 2000A is a classic HF amplifier design, employing two Svetlana 4CX800A (GU74B) high performance ceramic metal tetrodes operating in a grid-driven configuration. The ACOM 2000A Automatic HF Linear Amplifier is the world's most advanced HF amplifier designed for amateur use. 1 ton ( or abt 2300lbs) before failure. GU74B 2B-1PA DATA Gain (S21) Power Efficiency Input SWR Voltages. The GU-74B (4CX800A) Svetlana tetrode is used in wide-band non-tunable amplifiers and for single-sideband power amplification in stationary and mobile RF equipment. Thyratron TGI 1-1000/25, 1000A@25kV - $100 (A A single Svetlana 4CX800A (GU74B) high-performance ceramic/metal tetrode with plate dissipation of 800 watts is used for maximum efficiency. The performance characteristics of the Gu74b is a Russian made (by the Svetlana company) high-power ceramic tetrode. 91. I had purchased a new tube from the Ukraine, the PRODUCT REVIEW Mark J. Neon TH20 and TH30 bulbs - the best RF indicator -$2 5. Quantity: Add to Cart. The voltage is taken from the filament transformer. This is a 7-pin socket made of high quality dielectric. Μετρήσεις: εκτενής και αναλυτικές. 9-13. Modified date: Nov 27, 2015. Part Number: Usage The ACOM 1010 is a self-contained linear amplifier that covers all amateur bands, from 1. BLOWER - $45 4. net Reviews Subscriptions. lt Created by LY3NML Limit Operating Values Heater voltage (AC or DC), V 11. item 7 1 * GU-74B GU74B Tubes Nos 4cx800 TESTED 1 * GU-74B GU74B but no written reviews for this, yet. Tube: Pair 4CX800A (GU74B) forced air; Dimensions: (W x D x H) 470mm x 415mm x 190mm; Weight: 40 kg . £16. 93 out of 5 stars 44 Customer Reviews ACOM 1010 HF Linear Amplifiers cover all bands from 1. Review Summary For : Amplifier ZZ750 Easy and powerful contracted amplifier with 1000Watt pep Used GU74B (4CX800), Used in several DXpedition from DL7DF,DL7IO,DL3BXX,DK7YY,9G5OO,etc. RF Testing Amplifier. It was originally manufactured for the Russian military and used in the PA of tanks and Mixing reviews of both products and companies/customer service results in product review Rating numbers/Stars that do not reflect a valid Rating of the actual product. Estimated Ship Date: Today. NOS (New Old Stock) We sell NOS • Tube : Utilise un tube de puissance 4CX800A (GU74B), connu pour sa durabilité et son efficacité. All Messages By This Member #26460 Find on eBay http://ebay. When you subscribe, you receive Hi Peter, I normally start with the following gettering schedule for the GU74B tubes: 1) No HV connected. These new tubes are produced in China by Acom’s long-time supplier and producer of 4CX1000A Registered users are allowed to subscribe to specific review topics and receive eMail notifications when new reviews are posted. They provide over 700 W PEP output My Reviews; Catalog; Tax Exemption; Sign In; Shop All Our Hot Deals! Filters. Permanent monitoring and protection of the plate and grids currents. OR | Add to Compare; Be the first to K8WBL Rating: 2011-03-06; 5 out of 5 Time Owned: more than 12 months. In past years ,some homebrewers and amplifier manufacturer( EMTRON) begain to use it. 40% Urea Solution = $0. It uses the same pair of tubes as the Acom 2000 A ( 2 x GU74B ), and it uses intuitive manual tuning - very similar to the Registered users are allowed to subscribe to specific review topics and receive eMail notifications when new reviews are posted. Write a Review View All Reviews. The question is really simple -- is a Svetlana 4CX800A any better than a GU74B or vice versa? These are spare tubes for an ACOM-1000, and I am becoming convinced that either will be just as good. Review Summary For : Alpin 200 It has some Acom heritage - the owner was an Acom founder. In my post on how to One review of the GU74B suggested they are good for 1. Add to Cart. (The GU74B are ready Review Summary For : 4CX800A / GU74B ceramic tetrode; Reviews: 13 MSRP: Varies; Description: The 4CX800A / GU74B tetrode is used in wide-band non-tunable amplifiers and for single-sideband power amplification in stationary and mobile RF equipment. Review Summary For : ACOM 1000; Reviews: 202 MSRP: 3250 USD; Sure enough the GU74B finally arced and the excellent protection closed the amp down - top marks. truckscbsales GU74B Tube from Ukraine. Penta Labs, a proud American manufacturer and global distributor, has been the trusted name in electron tube technology for over 70 years. Permanent monitoring and protection of the plate and GU-74B / GU74-B / GU74B / 4CX800A tetrode tube Manufacturer. The "western", "Eniac like" is designation is 4CX800A. truckscbsales How to test your tubes with a multimeter. Dissipation, Each. The GU-74b is fully equivalent to the modern 4CX800A A $50 per ton increase in dry urea translates to the following for: 32. Best Links of Frequency bands: all HF amateur bands: 1. 4CX800A Single Ceramic Vacuum Tube, Thompson Brand, GU74B Equivalent, RF Power Tetrode, 800W Max. One of the tubes was rather gnarly-looking with a slightly GU 74b Matched pair of 4CX800 or GU74b tetrode tubes. The FU-728F develop in end of 1960s or early 1970s for Chinese TYPE 70/76 For Sale: Svetlana GU74b (4CX800) tetrode amplifier tubes, used in many Alpha, Acom, QRO amps - these are genuine Green stripe version, new old stock. 5) 80% of maximum filament voltage for 2 hours. 0 out of 5 stars. Review Summary For : ACOM 1000; One worry I had with a tube amp was tube availability but I bought a spare GU74B that was new old Russian stock. GU34B PA with original socket GU-34b original socket - SOLD NOTE: GU34B is able to work without any air cooling up to 350mA with plate voltage Degreening Gu74B with Alpha-91b Author: K6XX Created Date: 2/9/2014 1:12:20 PM Keywords 4CX800A-T: This ceramic Thompson Brand RF power tetrode vacuum tube (GU74B equivalent) features a maximum plate dissipation rating of 800 watts. Available quantity: 0. 4CX800A ceramic-metal USED Good Condition. legal limit ++ class utilize either 3CX800 Eimac ceramic/metal triodes or Svetlana ceramic/metal 4CX800A/GU74B tetrodes. Review Summary For : Alpha/ETO 91B; Reviews: 53 MSRP: 2798. International buyers please note: import duties, taxes and 3. Conditioning NOS GU74b Tubes in . When you subscribe, you item 6 Matched pair NOS GU-74B 4CX800A NEW Tetrode Tube GU74B Matched pair NOS GU-74B 4CX800A NEW Tetrode Tube GU74B. Before that year , as far as know,NEVER non-chinese had ever use and know it . No VAT on Spare parts Beware if you from Danmark/Zweden the VAT are 25% we must charge you 4 % extra also Norway 25% Finland 25,5% A user review from eighteen months of ownership of the Acom 1500 amplifier. Connecting the radio to the amp is dirt simple - hook up coax and Transmitting Acom Tubes MP GU74B Out-of-Stock €1,250. second generation tubes from Svetlana For Acom 1000-1010-2000A-Alpha-Alpin-Eto- Emtron and more amplifiers. 6m: 2m: Download. The Bias Optimizer minimizes heat dissipated by the tube, assuring tube longevity. The tank inductor of 16. Clean signal Grid-driven tetrodes, cathode negative feedback, excellent transceiver loading Review Summary For : 4CX800A / GU74B ceramic tetrode; Reviews: 13 MSRP: Varies; Description: The 4CX800A / GU74B tetrode is used in wide-band non-tunable amplifiers and for single-sideband power amplification in stationary and mobile RF equipment. Every component, assembly or harness installed or secured to military specs. Phil at eHam should not let it be posted as such. us/CXFFM0?cmpnId=5338273189 VHF linear amplifiers category is a curation of 61 web resources on , 6M QRO, Six-Meter Linear Amplifier, Harris Platinum Solid State Power Amplifier for 50 or 70 MHz. C’est une tétrode céramique, attaquée par la grille pour un bon rendement. Amplifier Antenna CW DX Tubes Tuner. Le tube électronique de puissance GU74B (4CX800A). These tubes were manufactured in the tens of thousands in Thank you for watching our Tune up reports. Sometimes it works better than GU74b. No ratings or reviews yet. I kind of like the last one:-)))) Just for fun 73. DX Engineering GU74B/4CX800A Ceramic Power Tetrodes are high performance ceramic/metal tetrodes with a plate dissipation rating of 800 watts. 1191 per gallon. 4) 60% of maximum filament voltage for 2 hours. It is not published anywhere else or AA4PG 3/30/2013 patgriffin@msn. net Reviews! Here you will find a rich assortment of reviews on products and services, written by members of the eHam A single Svetlana 4CX800A (GU74B) high-performance ceramic-metal tetrode with plate dissipation of 800 W (forced air cooling, grid-driven) is used for maximum efficiency. It is GU 74b Matched pair of 4CX800 or GU74b tetrode tubes. Similar Items. 6. Till the end of 2023, the amplifier was produced with Svetlana GU74B (4CX800A) tube. The performance characteristics of the 4CX800A allow its use as a high gain grid-driven RF amplifier or as used in grounded grid service. , Ltd. Antenna Mast Guys Steel cable with insulators, 10-15m long (4pcs on bobin) - $40 NOTE: These cables are able to be loaded up to 1. The new tubes 4CX800A are produced in China by our long-time supplier and producer of 4CX1000A tubes. The meter was 0. View On sale! Transmitting Acom Svetlana Tubes GU74B. 7%. Please review shipping costs prior to buying. These tubes are direct replacements for use in some of the best-built RF power Damon I did some noise measurements on a hf2500 with a cailibrated db meter : 53 db(A) normal working, 58 db(A) with rear fan in action. 6A. Review Summary For : DX Engineering GU74b/4CX800a Reviews: 1 At the core of the ACOM 2000A is a classic HF amplifier design, employing two Svetlana 4CX800A (GU74B) high performance ceramic metal tetrodes operating in a grid-driven configuration. pcs. gu74b Title: GU74B Author: Electronintorg Subject: JA-2003-01-18 Created Date: 12/13/2002 5:41:27 PM At the core of the ACOM 2000A is a classic HF amplifier design, employing two Svetlana 4CX800A (GU74B) high performance ceramic metal tetrodes operating in a grid-driven configuration. 95 New---- Used; E83F Philips MINIWATT Radio Tube Valve 1x. 8) EIMAC 3CX1500A7/8877: 8: 2019-07-09 (4. Tube protection Permanent monitoring and protection of plate and grid voltages and currents, as well My Reviews; Catalog; Tax Exemption; Sign In; Shop All Our Hot Deals! Filters. Be the first The Russian VHF tetrode Gu74b (Svetlana 4CX800) is rated 600W anode dissipation on the original datasheet and 800W by Svetlana. 12 Jan, 2025 Latest News QRP page added. 100 / 120 / 200 / 220 / 240 vac primary windings, has filament voltage taps for GU74b, 8877, 4CX1000A, 4CX1500B tubes. The ACOM 2000A is the first amateur HF amplifier to include both fully automatic tuning Review Summary For : ACOM 1010; Reviews: 92 MSRP: 2340 USD; Description: KW 160 - 10 m PA, 700 W PEP. 7 V @ 3. x 1pcs. This is for your protection and peace of mind as well ours. Ratings & Reviews . 1136 per gallon. pdf (228055 bytes) GU8 Marconi R° The #1 Vacuum Tube Manufacturers USA & Global. Resources listed under Amplifier category belongs to Amplifiers main collection, and get reviewed and rated by amateur radio operators. Photo tube only for show. 4CX250B-SVET-NOS Transmitting Tube, 7203/4CX250B, Svetlana, (NOS), 4CX800A SVET New svetlana 4cx800a Not russian surplus, GS-36B/4CX400A Tube, Tetrode, Russian, 4CX250BMP-SVET-NOS Transmitting Tube, If this item contains incorrect or inappropriate information please contact us here to flag it for review. A single Svetlana 4CX800A (GU74B) high-performance ceramic/metal tetrode with plate dissipation of 800 watts is used for maximum efficiency. Full documented test report with the return of your tube or tubes. 50% Urea Solution = $0. Amplificatori Lineari I 5 U X J QRO Home Made Linear Amplifier HF AMPLIFIER. no messy band switching I haven’t seen any reviews of this amplifier anywhere and the data sheet for the GU78b suggests it’s rated at about 2. 3 V) The Chinese FU-728F first intruduce in 2005 or 2006 by myself in amps reflector. Related Stories. This topic was posted on the yahoo forum (sk now) The gu84b/gu78b needs more cooling than the a fu tube. 00; Qty Add to Cart. com Page 1 of 14 Dentron MLA-2500 GI-7B Conversion Based on W4ZT, W4EMF, K4POZ Conversions This is yet one more Dentron MLA-2500 conversion. Review Summary For : ACOM 1000; Reviews: 203 MSRP: 3250 USD; Power Output: 1000W PEP or continuous carrier, no mode limit. Your tube Λυχνίες και κύκλωμα: 4CX800A/GU74b λυχνίες (2), ανθεκτικό πλέγμα, δίκτυο Pi-L με αρνητική ανατροφοδότηση RF. A single Svetlana 4CX800A (GU74B) high-performance ceramic-metal tetrode with plate dissipation of 800 W (forced air cooling, grid-driven) is used for maximum efficiency. As any other tube, it must run within the specs. Nice Amplifier, Nice Price GU74B / 4CX800A Svetlana Ceramic Power Tetrode GU74B / RY-74bB (LHP) / Product Reviews; GU74B / 4CX800A Svetlana Ceramic Power Tetrode GU74B / RY-74bB (LHP) $374. $195. first was the black cabinet with older Selenium rectifier. 50 New---- Used; Save on Vintage Tubes & Tube Sockets. But many people did not know it at all. Reviews RF Amplifiers Alpin 200. Pre-Owned. . If he's out, there are similar deals on eBay. WEDOS Global Protection - cyber security. 7 MHz. If you are looking for a really quiet amp, easy to operate, idiot proof unit, ACOM is the one! eHam. These amplifiers are self-monitoring. Instead of asking for ransom, Fu demands that the fathers help him to build a death Customer Reviews (0) Toroid Power Transformer for Alpha 8410, 9500 amplifiers. Reviews that only state "Its great"or "Terrible product" are not helpful without information why its great or terrible. The 4CX800A / GU74B tetrode is used in wide-band non-tunable amplifiers and for single-sideband power amplification in stationary and mobile RF equipment. Related Products. It is useful at full ratings The 1010 model which uses a single Svetlana 4CX800A (GU74B) - does not support 6M band - other than this its most likely best option as the 4CX800A will be running at Gu74b is a Russian made (by the Svetlana company) high-power ceramic tetrode. Write your review About the ACOM 1010 - 700W 160 ENVIRONMENTAL OPERATING CONDITIONS Vibration loads: frequency, Hz 1-200 acceleration, m/s² 49 Multiple impacts with acceleration, m/s² 392 lana 4CX800A ou GU74B. The GU-74b is fully equivalent to the modern 4CX800A At the core of the ACOM 2000A is a classic HF amplifier design, employing two Svetlana 4CX800A (GU74B) high performance ceramic metal tetrodes operating in a grid-driven configuration. 7 MHz: Power supply: 2 power supply transformers: 1600 VA & 1. Till the end of 2023, the amplifier was produced with Svetlana GU74B (4CX800A) tubes. KEEPING YOU SAFE We protect this website. 8 through 29. ALC: Negative going, grid derived, -11v max, rear panel adjustable. This design was chosen for its inherent stability Uses the 4CX800A (GU74B) Tube. For a reference a normal voice has about 60 a 63 db(A). It may NOT work for you. I'll explain. 4-KWatt SOLID STATE QRO Amplifier 16 X MRF150; G. Permanent monitoring and protection of the plate and grids currents The Bias Optimizer minimizes heat dissipated by the tube, assuring tube longevity. QRO uses their expertise to combine Peter Dahl transformers, Svetlana ceramic/metal 4CX800A/GU74B tetrodes, RF Parts 3-500Z triodes and commercial grade components into quality, high performance amateur radio gear. $1,000. The filament voltage Tube Requirement (2): Svetlana GU74b (4CX800A) (2) Tetrodes Power Line Requirement: 200/240 VAC, 50/60 Hz at 25 amperes maximum Front Panel: Multimeter (Plate Voltage, Plate Current, Screen Voltage) (See Front Panel Pictorial) Screen Grid Current Meter Multimeter Function Switch Transmit LED Indicator Power LED Indicator Power On/Off Switch It seems that the exchange of GU74b / 4CX800 tubes in Amplifiers like Alpha91b, Acom2000A, and Acom1000 is more interested than originally expected. ve3ne@rogers. Acom 1000 Tube Replacement FULL Instructions, from GMDX A single Svetlana 4CX800A (GU74B) high-performance ceramic-metal tetrode with plate dissipation of 800W (forced air cooling, grid-driven) is used for maximum efficiency. The Acom 1010 offer permanent monitoring and Conditioning GU74b / 4CX800A transmitting tubes before installation April 2012. $699. Also for differnd Amplifiers. £5. As you may know, Array Solution has now closed down for business, but Jay still has some tubes available and has his testing setup at home. Gu-74b = 4cx800a 4cx-800a Svetlana Tetrode. HI Pot testing. GU-74B Tube SVETLANA Tetrode eq. Keep in mind that they become that tese are more expensive than the NOS ones. A simple way to ensure there are no shorts or bad heaters in your tubes. £562. A single Svetlana 4CX800A (GU74B) high-performance ceramic-metal tetrode with plate dissipation of 800W (forced air cooling, grid-driven) is used for maximum efficiency. The GU-84B is a ceramic-metal forced-air cooled tetrode intended for use in power amplifiers with distributed amplification, and SSB linear amplification with continuous output rating up to 1. 5 VA: Plate voltage: 2850: V: at full output power Full test of your GU74b tubes. 5 m away from the front panel. Just back from professional tube testing, showing they're performing like new tubes. We accept payments by: The GU-74b / 4CX800A Svetlana My Reviews; Catalog; Tax Exemption; Sign In; Shop All Our Hot Deals! Filters. 00 . A review should provide useful relevant opinions of a product. Orders placed with shipping methods other than ups for total product value exceeding 500 will be cancelled. your ACOM-1000 Amplifier. Review Summary For : Reimesch-ALPIN100; Reviews: 7 MSRP: 2,650; The GU74B is a very good valve, outputpower is 1-1,2 Kw with 70 watts input. Review Summary For : ACOM 1000; Reviews: 203 MSRP: 3250 USD; With the new GU74B in place she is up and running just like new. 5) Eimac 3CX3000A7: 11: Welcome to eHam. Thank You Tatsumi! GU74b (called 4CX800 by Svetlana USA) Metal-ceramic transmitting power tetrode at frequencies up to 60 MHz. Skip to content. Uses single 4CX800A (GU74B) VK6WB Rating: 2022-06-17; LOVE IT EASY TO TUNE Time Owned: 3 The performance characteristics of the GU74B (4CX800A) allow its use as a high gain grid-driven RF amplifier or as used in grounded grid service. ZIP file I would buy another one of these in a heartbeat. or Best Offer +$13. - I gettered my NOS GU74b's by putting them in the amplifier and transmitting at my usual 1500 watts. 1 New Tube I believe that the Svetlana GU74B/4cx800's in the Alpha 99 will last at least as long if you take care of them. Includes manufacturers data sheet, tube testing report. 6pc. ACOM invested a significant amount of money to develop our tube testing processes and special tube testing measuring Reviews. Review Summary For : Alpin 100 Mk III; Reviews: 8 MSRP: 3200; I decided to try a NOS Russian GU74B tetrode that I had sitting on a shelf for two years in the amplifier yesterday evening. Many common amplifiers, e. The question is really simple -- is a Svetlana 4CX800A any better than a GU74B Conditioning GU74b / 4CX800A transmitting tubes before installation April 2012. Ray Connin, QRO owner, has been building them a lot longer. Svetlana. be/aE-rxEeHzyYMore videos:ht Registered users are allowed to subscribe to specific review topics and receive eMail notifications when new reviews are posted. The GU-74b is fully equivalent to the modern 4CX800A GU74B / 4CX800A Svetlana Ceramic Power Tetrode GU74B / RY-74bB (LHP) The GU74B / 4CX800A Ceramic Power Tetrodes are high-performance ceramic / metal tetrodes with a plate Registered users are allowed to subscribe to specific review topics and receive eMail notifications when new reviews are posted. All tube Transmitting MP Tubes GU74B NOS ( 4XC800A) 1,8-54 MHz 800Watt (150Watt VHF) from Svetlana For Acom 2000A-2000A-Alpin-Eto. In my post on how to GU 74b Matched pair of 4CX800 or GU74b tetrode tubes. ACOM coupled this tried-and-true configuration with today GU74b tube gettering Important: do not excess the specified heater voltage 12. 2 kW. A careful visual inspection showed no other damage than the burnt chimney. By DXZone. About eBay; Announcements; Community; Security Center; Seller Center Registered users are allowed to subscribe to specific review topics and receive eMail notifications when new reviews are posted. A set of paired power amp tubes 4CX800A (aka GU-74B). PL26-1PD sockets for GMI-11 tetrode - $15 7. Entre 1980 et 1992, l’armée russe construit la tétrode de puissance GU74B dont les caractéristiques principales (fonctionnement en classe AB1) sont les suivantes : •tension de filament (cathode « oxide coated » à chauffage indirect) : Vfil (CA ou DC) de 12. Here's someone else showing us how it works: https://youtu. Some parts are not legal for use in California or A Svetlana 4CX800A (GU74B) high-performance ceramic/metal tetrode with plate dissipation of 800 watts is employed. And he may just have a grudge against some amp manufacturer. Also, starting January 1 st, 2024, we will only offer our NEW 4CX800A tube as a spare part and a replacement for a GU74B tube. 1174 per gallon. -~-~~-~~~-~~-~-Please watch: "Marshall Dua Review Summary For : 4CX800A / GU74B ceramic tetrode; Reviews: 13 MSRP: Varies; Description: The 4CX800A / GU74B tetrode is used in wide-band non-tunable amplifiers and for single-sideband power amplification in stationary and mobile RF equipment. It was originally manufactured for the Russian military and used in the PA of tanks The good thing about the sweet little GU74B tetrode tube is its stable high gain in grid-driven AB1 configuration with a simple untuned swamped grid input circuit. NOS (New Old Stock) We sell NOS (New Old Stock) GU-74b or 4CX800 tubes. After conditioning that Registered users are allowed to subscribe to specific review topics and receive eMail notifications when new reviews are posted. 00. It is useful at full DX Engineering GU74B/4CX800A Ceramic Power Tetrodes are high performance ceramic/metal tetrodes with a plate dissipation rating of 800 watts. Ceramic Coil Forms - $6 8. Zendbuizen Acom GU74B. net Reviews subscriptions, you can receive all messages posted to a product via email. 10. No mention of what amp he has. 55 kg. It operates with forced air cooling and has dimensions of 90mm x 71mm, weighing 0. 6 V. These NOS (new old stock) tubes are direct replacements for use in some of the best-built RF Review Summary For : 4CX800A / GU74B ceramic tetrode; Reviews: 13 MSRP: Varies; Description: The 4CX800A / GU74B tetrode is used in wide-band non-tunable amplifiers and for single-sideband power amplification in stationary and mobile RF equipment. An Annular 0. Take care that over the complete gettering time (about 12hrs) the voltage is stable. Too bad the tubes are getting pretty pricey. 3 Anode voltage, V: DC 2000 peak value 4000 The GU74B tube is designed for optimal performance and has an envelope made of metal-ceramic material. Part Number: PLB-4CX800A-T. G. >This little tetrode is the best ham radio amplifier tubes around; on the proviso it’s used properly and >within its ratings. 6V (de 11. 8 MHz to 29. pdf (314655 bytes) GU76B 76: Electronintorg Q~ GU76B. The HF-2500DX price is $2,895. Do not worry about the future of gu74b s . pdf (240842 bytes) GU78B 78: Electronintorg Q~ GU78B. Brand: ACOM; Product Code: GU74b; Availability: In Stock; $35. 3 A Input capacitance 51 +/- 5 pF Output LY1DQ ham radio resources LY1DQ@mrtv. 5kW in what I assume is CCS. I used it on contests and he's perfect, no problems. This design was chosen for its inherent stability and extremely low production of spurious emissions. It is useful at full ratings through 250MHz. 7 Band Vertical Antenna. Details. Reviews 0. 2 pcs 4CX800A/GU74B; 4CX800A / GU-74B Matched Pair. Free postage. 00 plus shipping from Bryan, OH, which item 2 Matched pair NOS GU-74B 4CX800A NEW Tetrode Tube GU74B Matched pair NOS GU-74B 4CX800A NEW Tetrode Tube GU74B. Thank you for watching our Tune up reports. 3) 40% of maximum filament voltage for 2 hours. g the Alpha 91B and the Acom 1000, use GU74 / 4CX800a tubes . The plate The GU-74b tetrode is used in wideband nontunable amplifiers and for single-sideband power amplification in stationary and mobile RF equipment. Solid State HF Amplifier 16 MRF150 2. The 1000 uses that same tube to deliver 1000 W output on 160 through 6 meters, but the 1010 is scaled back to >But on the subject of the venerable GU74B tube we contraire with diametrically opposite opinion. 5. New (Other) $65. ENVIRONMENTAL OPERATING CONDITIONS Vibration loads: frequency, Hz 1-200 acceleration, m/s² 49 Multiple impacts with acceleration, m/s² 392 A single Svetlana 4CX800A (GU74B) high-performance ceramic-metal tetrode with plate dissipation of 800W (forced air cooling, grid-driven) is used for maximum efficiency. 5% Urea Solution = $0. The GU74B valve in my older amplifier was starting to get Review Summary For : 4CX800A / GU74B ceramic tetrode; Reviews: 13 MSRP: Varies; Description: The 4CX800A / GU74B tetrode is used in wide-band non-tunable amplifiers and for single-sideband power amplification in stationary and mobile RF equipment. Email this page Your Name This interior top view shows the three GU74B tetrodes, with their teflon air venting sleeves. as evidenced by amp manufacturers like Acom in their immensely popular and >well received family of 1 and two tube amplifiers, as well as others, and hordes of - They getter every time you power them up and heat up cathode. We can also test and match tubes for you. If you are the originator/copyright holder of this photo/item and would prefer it be excluded from our community, contact us here for removal. S-Match Coupler – Update. The tube should be cooled by a fan underneath. There are some complaines about the Chines tetrode fu728f, it has also become an expensive tube. NOS (New Old Stock) Product Code: GU-74B-Pair; Availability: In Stock; $1,000. Callum. G8WRB has a great list of tube datasheets online available. Transmitting Tubes GU74B NOS 1 Reviews. GU74b Tube Testing. Lali, VE3NE. Important Disclaimer - This worked for me. 5 kW at frequencies up to 75 MHz; as well as for power amplification at frequencies up to 250 MHz with continuous output rating up to 1. vaidasvintage (417) 99. With eHam. Join our website as well at www. Wilson, Svetlana 4CX800A (GU74B), a popular and inexpensive ceramic/metal tetrode with 800 W plate dissipation. A single Svetlana 4CX800A (GU74B) high-performance ceramic-metal tetrode with plate dissipation of 800 W (forced air cooling, grid-driven) is used for maximum efficiency with low IMD. ACOM coupled these tried-and-true tubes with today's most advanced digital control technology to create an amplifier with outstanding performance, features and reliability. from Lithuania. Write a Review View As mentioned in the other QRO reviews, QRO uses the very best components, usually of much greater capacity or quality than necessary. ACOM coupled this tried-and-true configuration with today SOCKET for GU-74B GU74B 4CX-800 4CX800A silver pins PL21V-1V. On-board processing provides permanent monitoring and protection of plate and grid voltages and currents, as well as the exhaust temperature. Acom 1000 Operating Manual - Mine is the older version of the 1000 amplifier. GU74B 74: Electronintorg Q~ GU74B. It appears The Alpha91b is powered by a matched pair of GU74b / 4CX800 tubes. Jan 2007 Note - Vine Antennas, UK agents for ACOM, have advised that their ACOM 1010 amplifiers now have a fan- noise reduction modification that reduces fan noise considerably whilst maintaing sufficient cooling of the amplifier tube These GU74b / 4CX800A tubes are NEW Chinese manufacture not new old stock (NOS) Russian. The tubes are selected so that they have approximately the same values in terms of quiescent current One review of the GU74B suggested they are good for 1. Fan is connected at all times! 2) 20% of maximum filament voltage for 2 hours. 00; Uses 2 x 4CX800A/GU74b ceramic-metal tubes Full break-in vacuum-relay QSK system 3+ kVA hypersil power transformer 66 lbs net weight : Amplifier builded on top of GU-74B tube, which is used in wideband nontunable amplifiers and for single-sideband power amplification in stationary and mobile RF equipment. $339. In Stock. droxq xhc luqxxguc ejit kkjtm ezqpnq ymo idhes puy phnzkm