Click on shaded areas and then use the back button on your browser. The GI7b amplifier in its finished state. 1. A 23cm AMPLIFIER USING THE GI-7 TUBE. SSPA 2m 1 KW MRFE6VP61K25. UG:HF+50-50/1200. Can be used for mobile or base amplifiers 1296 Mhz 800 watt ham amplifier:$305. GI-6B Russian NEW Tube power amplifier QRO HF VHF UHF GI6B GI-7B GI-7BT GI7B. GI-7BT (GI-7B/GI7B,Tropical) Tube. I am writing to give information about a very special Russian-made transmitting valve, named Gi7B (sounds like some special event station from Northern Ireland!). jingfang. The GI-7B with a heat sink and the GI-70B with no heat sink. The GI-7BT is a more ruggedized version of the same tube featuring a fatter ceramic element but otherwise the The GI-7b, GI-70b and GI-7bT microwave triode operates as an oscillator or an amplifier in continuous-wave or pulsed mode with anode modulation in the centimetric and decimetric wavelength ranges. That might be due to the smaller power transformer or it could be something I screwed up. 00 + $12. . e. Fig 2: Fig 2 shows that load line laid over the GI7BT anode characteristics. , Bend, Oregon USA ABSTRACT In an earlier article, the author described a 50 MHz 125V 250W class C amplifier using the ARF448A/B high voltage MOSFET devices. 6 WD8DAS SB-230 Amplifier Tube Retrofit Project. Title: GI7B Schematic Author: tlee Created Date: 6/21/2004 5:32:22 PM GI-6B SAME AS GI7B Tube Amplifier QRO HF VHF UHF TRIODE GI6B, Military equipment - EUR 16,95. I built this amplifier with a single GI-46B Russian triode to see if performance is as good or better than my standard 2 x GI-6B unitsThe GI-46B tube has a bulkier body than the 6B tubes, with an excellent removable cooling Build a 6-meter 85 watt PEP SSB amplifier using a MRF 492 BJT. 2. The GI-7B (GI-70B) microwave triode operates as an oscillator and an amplifier in continuous-wave or pulsed mode with anode modulation in the centimetric and decimetric wavelength ranges. + $12. Please don't ask for specific details on this project. A complete overview. The GI7B tubes are in place. The tube is a Eimac 8873 which is designed for conduction cooling. this was bought of a fellow amateur via E-Bay. Another inside view, left Hv transf and Hv rectif board. auf 10mm GND 5mH GND 2x60uH auf Ringkern 5n 5KV GND BT-5-S 47Ohm 2W 12 V+ 12 V-12 V+ an Lüfter 12 V- an Lüfter 30-1000 pF GND 7 uH 24V Relais 10A Schaltstrom 10-20/30-40 5 uH 24V Relais 10A I like building high power amplifiers with tubes like GU74b, 4CX1000A, GS31b. GI-7B amplifier for 6 Meters. This is a coaxial-type valve, apparently developed to be primarily used in radar systems, but it is very useful for any frequency from zero to nearly 3GHz. Hello everybody, this post is about my passion for DIY. inside with fiberglass protection. The GI7b was my choice of tube due to its proven abilities, low cost (some 15 Euro) and solid 13 dB power gain. G4DCV 2 x GI7b 144Mhz amplifier. Most wanted DXCC countries on 144 MHz. 74 Buy It Now 12d 14h. The amount of amplifier gain and power is very much dependent on the. Fig 1: Fig 1 suggests an initial load line from cutoff at 2250 to peak anode current of 1. 00 shipping. • RF output: 1500-2000 W keyed carrier or SSB - no time limit. a next generation of GI-7B coaxial triode series. GI7B Six Meter Amplifier Project. They were supplied with the filament votlage for few hours. With this linear you can make 350-400 Watts on SSB. Th input uses only a 10nF coupling capacitor and is tuned by rig AT. Logan (VR2XRW) gave me a 10mm ferrite rod for the filament choke, it is in place all together with the input tune, consists of two Arco variable capacitors and 15mm dia. 50: 25ohm/50W StripLines Resistors. Listed under the Technical Reference/Amplifiers/HF Amplifiers category that is about Amateur linear amplifiers. Originally designed for his GS31b Doorknob amplifier, it matches the GI7bs perfectly with unity SWR. This has nothing to do with the Disney movies, i decided on Piglet as I consider the amp to be the daughter of my GS35b amplifier that acquired the name 'The Pig', the reasons for that can be found elsewhere on my web site. The tubes GI6b, GI7b, GI7bt, GI70b and GI70bt are all the same GI7b. EA6VQ's EME calendar DG7YBN Excel BC for Semi-Insulated Elements on Boom Calculator; DG7YBN TANT manual; 50 & 144 MHz online chat a Linear Amplifier by Dave Barber --K5NDB Ross Lawler --W5HFF Rick Hiller --W5RH April 8, 2010 •i. In year 2000, three of us ( VR2XMQ, VR2IL and me ) purchase a very nice Russian Tube (GI7B) from Dr. 0. Ma> I am contemplating building a 144MHz power amp and looking at various Ma> options. I have a homemade amplifier with 2 GI7B for HF and I have about 800-900 watt in my bird 43 wattmeter. The seller is "spitfirecbs" and is located in Gloucester. Seller 99. GI-7B with minor modifications (see schematic) of the original GLA-1000 design. The FL-2100B Linear Amplifier is designed to match the FT-101B/277B transceivers in appearance and drive requirements to run high power input covering the ham bands 80 through 10 meters. First up is the power supply. (Only valid for the amplifier type with four amplifier stages and a. The MLA-2500 will produce an input power of 2KW PEP. Partial front and top view. In input circuit of the GI7B tube. EA6VQ's EME calendar DG7YBN Excel BC for Semi-Insulated Elements on Boom Calculator; DG7YBN TANT manual; 50 & 144 MHz online chat The Gemini HF-1K is a solid-state 1kW 1. WD8DAS SB-230 Amplifier Tube Retrofit Project. K4POZ Legal Limit Home Brew 160-10 Meters Pair of GI-7B's In An L4B Cabinet gi7b, terry 55 amp, gi7b amplifier, terry 55 amps , gi-7b, terry 55 bull-it amps, 55 bull-it amp, Cottonpicker amps, terry 55 antenna, terry55 amp for sale, mods with gi7b, gi-7b amplifier, cotton picker amplifiers, gi7b cb amplifier, terry 55 bull-it amp, 55bull-it made, powered by vBulletin price is right home viewer contest winners, terry 55 built antennas florida, gi7b tube, bull it made GI7B Amplifier Notes. This revolutionary new amplifier delivers maximum legal power in all modes and operates on all HF amateur bands. I have one commercial amplifier in my shack. VHF LINEAR AMPLIFIER 144 MHz WITH TH328. New. --------------D58C6695EBAA9A9A3A5CDB95 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit I am in the early stage of building a pair of Russian GI7B triodes in GG. VHF PA 6 m 2x GI7B. Since this particular amp was worked on, many lessons have been learned. A Poor Man's 50MHz kW Amplifier by Goran Grubisšic, 9A6C There's hardly anything new to add about grounded-grid triode amplifiers. SO-239 and bird mounting cut out . Gi7b homemade HF amplifier. 00 shipping + $12. Power The GI7b amplifier in its finished state. Sold Out. New in Box. GI7b Linear This page shown only for historical reasons, the amplifier is no longer in my possesion, but has found a new home at OZ6YM! The saga about my 144 MHz GI7b Linear: In 2000 I acquired a second- (third or fourth) hand job, originally built by HG8UG, bought in DL-land from DG5NFF (I believe) by OZ1BNN last year. 144 MHz PA s 2x GI7B. UHF LINEAR AMPLIFIER 432 MHz WITH TH328. ZU VERKAUFEN! GI7B / GI-7B HF-VHF-UHF POWER COAXIAL TRIODE TUBES NOS LOT OF 4 252680306921 800 W. 8877 “Lite”–A 50-MHz 20-Pound Travel Amplifier by Dick Hanson, K5AN January 2006 QEX pp. NB. Inside without prtection. 50: GS-35B (GS35B,GS35) 2500 W triode. The Gemini HF-1K is a solid-state 1kW 1. Pride DX300. Charlie was strongly recommending the Gi7b - he was possibly the first to have converted the MLA2500 Dentron to use these tubes and many mods with this tube have been published since. 5KW 3 X Gi7B, IK4EEP: GI7B 6m amplifier, GD0TEP: GI7B, GS31B, GS35b Amplifiers, IK1XEY: G0MJW Hf 6mt 2mt 70cm 23 cm 13 cm: GJ4ICD's 8877 50MHz Amplifier Wizard Amp with 2 GI7B tubes. Ma> It appears that the Gi7B and family of Triodes can provide an equally Ma> capable solution. Please note: This was an early effort at retrofitting the SB-230 amplifier. This can be selected by the operator to be either an output voltage on the rear panel or a coax bias-T feed as required. The tube was in a cooling case. The item "Yaesu FL-2500 HF Amplifier converted to 2 x Gi7B Russian Ceramic Triodes" is in sale since Sunday, October 21, 2018. 8v preamplifier supply on receive. The PI-Filter hat two switchable coils, because the roller induct-or was to small. Alex UR4LL for the intention of building amplifier for six meters. 50: Vacuum Variable Cap. GU43b tube. 75W on FM. In addition, I have several of the GS-31b Russian triodes a couple of which I am VERY slowly building an all band, 160-meters through 10-meters, amplifier as well as replacing the tube in a badly "hacked" Hallicrafters HT-33A linear amplifier. Tento PA je na fotografiích jinde na našich stránkách. HF Amplifier repair. Meter and switching and lampe status. This particular W4NFR This "Home Brewed" Amplifier uses a single Russian GS-35B Power Tube and has an output power of 1. It is a large doorknob style from Russia. and a small muffin fan running at reduced voltage. HF-Amplifier with 4CX1000A build into the cabinet of the amplifier with a GS31b Build a 6-meter 85 watt PEP SSB amplifier using a MRF 492 BJT. The idea was to make a mechanically and thermally stable design using thick walled standard metric copper tubing. At right side can see the RF section. The original concept by marketing was a cheap, two-tube amplifier, but I convinced marketing that the life of two tubes would be far too short. The negative side of the 24V relay supply should be connected to ground. Front panel. GI7b and GI7bt are completed by factory with plate radiators (HgAl) and the others (#70) without (normaly used in water cooling items). . 10-160 m + WARC / 6 m. A falcon (UA6CL) Amplifier with gu74b Find Gi7b Amplifier related suppliers, manufacturers, products and specifications on GlobalSpec - a trusted source of Gi7b Amplifier information. 4-KWatt SOLID STATE QRO Amplifier 16 X MRF150; G. Dimensions: 12 1/4" x 13 1/2" x 10 1/4" This cabinet IS designed for a compliment of GI46B GI7B GS31B or power supply And more. gi7b, terry 55 amp, gi7b amplifier, terry 55 amps , gi-7b, terry 55 bull-it amps, 55 bull-it amp, Cottonpicker amps, terry 55 antenna, terry55 amp for sale, mods with gi7b, gi-7b amplifier, cotton picker amplifiers, gi7b cb amplifier, terry 55 bull-it amp, 55bull-it made, powered by vBulletin price is right home viewer contest winners, terry 55 built antennas florida, gi7b tube, bull it made This is a multi-part message in MIME format. $30. GS-9B GI-7B GI-6B GI-70B GI-7BT COOLER only GI7B GI6B and many Dentron MLA-2500 HF Amateur Ham Radio Linear Amplifier For SaleThe MLA-2500 is a good quality SSB linear amplifier with 600watts total plate dissipation and a 1KW DC CCS input rating,covering the traditional HF ham bands from 160 to 10 meters. 2*GI7b tubes. This GI7b amplifier is based on the YU1AW design that can be found on the internet, it's sometimes called the Lazy Builders amp. Regular price $450 00 $450. This is definitely not plug and play. As seen above the blocking cap is close to the coil. Direct grounding of the grid to the chassis is mandatory in amplifiers above 30MHz, and it is the most common option for HF amplifiers also. Most of the time I am running my homemade amplifier with a 4CX1000A That tube was originally a spare for a 30S-1 by Collins. 5KW 3 X Gi7B, IK4EEP: GI7B 6m amplifier, GD0TEP: GI7B, GS31B, GS35b Amplifiers, IK1XEY: G0MJW Hf 6mt 2mt 70cm 23 cm 13 cm: GJ4ICD's 8877 50MHz Amplifier 2pcs GI6B same as GI7B Tube Amplifier 350W HF VHF UHF GI-6B. Glen, K9STH CT2JLS Ham Member QRZ Page. KO4NR GLA-1000 Homepage ND2X Homepage UR4LL Conversion Tubes & Parts G4DCV's 144MHz amplifier with a pair of GI-7b Russian triodes: G8ACE Medium Power Amplifiers for 24Ghz: BANDIT 1000A, IK0IXI: GI7B amplificatore lineare 1. Turn on power to the amp but leave the STBY/OPR switch in the STBY position. $35. Using a pair of 3CX800A7s, this 6- and 2-meter amplifier yields the legal-limit. There was an arc between the cap and the coil. This converted amplifier requires less drive than the 100 watts many transceivers provide. Amplificatori Lineari I 5 U X J QRO Home Made Linear Amplifier HF AMPLIFIER. Bias Considerations for HF Amplifiers GI7B Tuned Input Values Custom Meter Face for the GLA-1000 Constructing a GI7B Socket Constructing the GLA Tuned Input GI7B Socket Layout Pattern Fine Tuning the GLA-1000 PC Board Parts Placement High Voltage Fuse Board. Thanks to YU1AW for the input circuit. This is the original amplifier. Heatsink removed, plenty of vent holes all around. The GI-7"b" is available in two variants differing in the type of cooling: the GI-7b with a heat sink for forced air cooling and the GI-70b with no heat sink for other systems of cooling. Pictured is a water cooled 800 watt 1296 amplifier. 6 Rather it is presented to illustrate how, with a little work and ingenuity, you can retrofit an older amp with the GI-7B tubes and regain new life and extended service. This retrofit requires some metal cutting and moving of the RF sampling board and antenna relay. 05A at 200V. Addition of a + 10 Ω/15 W non-inductive resistor (R) is a simple way of correcting the overdrive. Another issue is the highly toxic BeO heat transfer block - I am glad to get rid of it. This item is in the category "Mobile Phones & Communication\Radio Communication Equipment\Ham/Amateur Radio\Ham Radio Amplifiers". homemade amplifier with 4CX1000A. I have a 24vct filamanet transformer, so I plan on using it and doing the filaments in series since they are 12. GI7B. The GI-7B (t) is a very rugged metal ceramic tube built during the cold war for use on Russian tanks and other military vehicles. V roce 2006 jsme s Jakubem OK1FVN dostali za úkol poradit si s 2m PA 1kW s GU43B, který vykazoval vysoké vstupní PSV při zaklíčování. The tube is not produced any more. NEW IN BOX $124. What key features would turn the SB200 into a contemporary amp with modern creature comforts? And what tube would do the job. The obvious solution is a pair of push pull 4CX250Bs. With the amp still in the STBY position, adjust the output of the exciter in CW mode to about half of the GI-46B Tube. Air-cooled Russian GI-7B triode replaces the conduction-cooled 8873. ˘ ˇˆ˙ ˝˛ ˚ˆ˜ ˝ˆ ˇ ˝ ˝! ˜ " ˆ ˙ˆ# !˜ $ % ˆ˙! $ ˜˛ & ˆ ˜ ˛ ’ˇ. Tím OK1KVK/OL7C neměl jiný PA na vysílání při závodech než stařičký 300W PA s RE025A, kterému bude snad přes GI7B 50 Mhz LinearAmplifier. A very friend of mine give me a 2 tubes GI46B and I have seen that a GI46B = 2 GI7B; same voltage but more power. Kevin has regularly used it to acivate JO00 square mainly on MS but also with some tropo and EME. They appear to be much easier to cool, by something Ma> like an Axial Papst Fan (instead of a Snail Blower). K4POZ Legal Limit Home Brew 160-10 Meters Pair of GI-7B's In An L4B Cabinet GI-7B, GI7B, GI-7BT, GI7BT, Russian, Triode, Tube, Socket, Linear, Amp, Amplifier, Project, HF, VHF, UHF, w4zt, ham radio, amateur radio, uyless, uyless king, tony 2PCS GI-6B w/o cooler same as GI-7B Russian NEW Tubes power amplifier GI6B GI7B. This warm up is important to ensure the directly-heated cathodes of the tubes are fully functional. It is two combined N2UO GI7b cavities with proper combiners and dividers. The net filter on the 220V side. A 300W MOSFET Linear Amplifier for 50 MHz Richard Frey, Sr. Tím OK1KVK/OL7C neměl jiný PA na vysílání při závodech než stařičký 300W PA s RE025A, kterému bude snad přes The item "Yaesu FL-2500 HF Amplifier converted to 2 x Gi7B Russian Ceramic Triodes" is in sale since Sunday, October 21, 2018. The FL-2100B uses a pair of 572B/T160 transmitting triodes in a class B grounded grid circuit configuration. As I was coming to the end of a session in the shack I had made the mistake of operating without the cooling fan on full speed which resulted in a resistor overheating whilst tuning up during a change of band. final stage with two transistors in parallel) General. It requires a 2500 volt HV power supply available, water cooling pump and a Linear Amplifier by Dave Barber --K5NDB Ross Lawler --W5HFF Rick Hiller --W5RH April 8, 2010 •i. Free VHF-UHF-SHF power amplifier schemes. I start homebrewing an HF amplifier based in a GI-7B tube, using a grounded grid configuration. Hand dryer brushless blower as forced cooling for Linear Power Amplifier with GI7B. $42. It seems to work pretty well although not putting out the power like the HF amp. It was more than 35 50 MHz amplifier with three GI7B (French) ARRL EME contest multiplier checklist; Amplifier power linear. It uses a PAIR of BLF188XR dual-LDMOS power devices for reliability and high spectral purity and has an internal highly reliable low-noise switching power supply, in order to reduce the overall weight. More than a fair degree of interpolation is needed to characterise the loadline in RF Power Amplifier Tube Performance Computer. G. 6% positive. PA 6 m GS35 b. In his own words the amp has worked a lot of very nice DX! This is a multi-part message in MIME format. As with all of my amplifiers, it has been given a name and this one is Piglet. 4cx5000A. Regular price $950 00 $950. The chimney is shortened and the fan can blow direct to the anode cooler. Eimac datagives the pair of 8875 triodes an output rating of 1174 watts CCS. $15. The PA units deliver anything. 1 This paper now describes an improved 2500 Volt at about 1 Amp. A real work of art. The bias circuit is based in a 34v (24+10) zenner diode. between 10-20++ Watts output with 10-30mW input on the amateur. ZU VERKAUFEN! 1Lot = 1Tube! Actual Item is pictured GI-6B PULSE TRIODE TUBES Metall 293176096546 The 1296 MHz Gemini 23 incorporates a front panel switchable 13. Let the amp warm up for at least 2 minutes. It was more than 35 QRO-Parts. Solid State HF Amplifier 16 MRF150 2. Permalink. 5kV for the anode and the filament needs 10v at 5 Amp so we are going to need a BIG transformer. VHF PA GS35B - YU1AW design. Last update to this page was on May 28, 2014. I have made the most of the propagation which has been up and down but worth the effort, as I put out some nice signals into North and South America as well as the Caribbean. SSPA 432 MHz 500W. 8MHz – 50MHz power amplifier with additional capability at 472kHz. SSPA 23 cm 200W- BLF6G15LS-250. The 1296 MHz Gemini 23 incorporates a front panel switchable 13. Building a large power amplifier is really two projects in one, the power supply and the amp itself. 20-1000 pF/10kV $159. The 813’s need about 2. EL509’s or Russian GI7B tubes. 50 GI7B / GI-7B HF-VHF-UHF POWER COAXIAL TRIODE TUBES NOS LOT 4 Pcs. 5 KW. 20-1000 pF/10kV Brand New $189. The 2m amplifier with the pair of GI7Bs is now 10 years old and has been on loan to Kevin G1KAW since I built my GS31 amplifier. 50 Mhz linear amplifier with a single GI7B. 00. Title: GI7B GI70B Author: Electronintorg Subject: JA-2003-01-16 Created Date: 12/14/2002 7:52:05 PM 1. 8 - 30 Mhz 1. Hi allBack again as promised with my new prototype 6 meter amplifier. It's craftsmanship at it's best by W9DCO sk. Amp Conversion Links. Figure 1. Last week I had a slight misfortune with my GI7B valve amplifier. Has provisions in bottom panel for rubber cabinet feet . com GS35b GU84b GU74B GI7b 4CX800a Svetlana Tubes also Russian made capacitors,vacuum relay,coaxial relay, parts for HAM Radio,linear amplifier builders Surplus 23cm power amplifiers. The bias circurit. Here below you will find some shots of the various stages of assembly and a short video of the final test. GI7B 50 Mhz LinearAmplifier. The tubes GI6b, GI7b, GI7bt, GI70b and GI70bt are all the same GI7b (=LD7). The power supply side with near 2000 Volt. Post by GI7B Anyone know a UK source of HT transformers? Looking for about 2000 to 50 MHz amplifier with three GI7B (French) ARRL EME contest multiplier checklist; Amplifier power linear. I have used my amplifier with a good GI46B and I had about 800 watt Find Gi7b Amplifier related suppliers, manufacturers, products and specifications on GlobalSpec - a trusted source of Gi7b Amplifier information. The output coupler is PI network with a plate cap 5-60pF an inductor of 1uH and a load cap 10-600pF. I designed the AL811 series amplifiers in the late 1980's or early 1990's. There are quite a few Internet sites with descriptions of such amplifiers. •LA1000A –No tune inputs GI7B 24V Relais Rollspule 3uH 150uH 2n 8KV 5n 1KV 5n 1KV 18-200 pF 30K 11W PL TRX PL ANT PTT Connector 2000 V- 24 V-GND 3A GND GND 47Ohm 2W 1,5 Wind. Nevertheless, it is usable. The tubes are forced-air cooled by two very quiet Hand dryer brushless blower as forced cooling for Linear Power Amplifier with GI7B. frequencies 1260-1300Mhz. Lot of 2pcs $15. SB-230 Retrofit Using the GI-7B by K4POZ September - October, 2006. The ACOM 2000A is the first amateur HF amplifier to include both fully automatic tuning and sophisticated digital control capabilities. Brian Reay 2010-03-28 16:24:07 UTC. Here's a picture of the guts. The Dentron MLA-2500 amp is a very good amplifier to retrofit using the GI-7B tubes. 41-46. Triode Amplifier Control and Protection Please don’t start to build the Triode Board until you have read all of Sections 3–5. Automatics realized on the power contactors, which implements: I have a homemade amplifier with 2 GI7B for HF and I have about 800-900 watt in my bird 43 wattmeter. All About the GI-7B. GI7B Six Meter Amplifier Project - Update 6. 2 KW. See Details. Regular price $500 00 $500. The prototype shown on the photos was built and tested by Pavle, S57RA. •LA1000A –No tune inputs The amp also needed more cooling, one more fan installed. GEMINI 23 is a complete turnkey solution incorporating an integral 50V linear power supply so no external PSU is required. During a visit to an HAM exchange exhibition ( Radiantistica Expo) I came up with the idea of building an amplifier using the mythical Russian tube Gi7b. It is an ETO 91b by Alpha with a couple of GU74b tetrodes. I like building high power amplifiers with tubes like GU74b, 4CX1000A, GS31b. Applications Engineer, Advanced Power Technology, Inc. The other fan is cooling the cathode and up to the chimney. Top view. gi7b is tube designed for microwaves but working good as hf amplifier idea is to build cheap reliable hf amplifier covering 160 meters band . coil. I talked them into a bare bones minimum three tube amp, and a slightly more refined four-tube amp. This portable amplifier will put out 1500 watts with 50 watts input. So here it is…. SPA 144 MHz 1 KW. When we are building a linear power amplifier with electronic tube(s), one of the important construction detail is successful cooling. 6 meter GI-46B prototype amplifier. This is based on a CT1DMK design, with the anode cavity recalculated from rectangular to cylindrical shape. I built another GI-7B amp - this one for Six Meters. es The last two weeks have been interesting on the bands especially with the new Russian GI7B x2 amplifier in line and working well. www. The Triode Board is designed only for grounded-grid triode RF power amplifiers. - EUR 70,86. I saw a lot of successful and less successful tube cooling solutions, but you can see my solution at my photo album page. And to that extent, it is! - (Please see notes below regarding using the GM3SEK control board with a toroid transformer) GI-7B GI7B Sockets and Projects - W4ZT. UG:HF+50-50/1500.