gs35b.comGS-35B GS35B Russian Triode Tube,Socket and Teflon Chimney - Linear Amp Project - HF, VHF, UHF Ampli

http://gs35b.com http://gi7b.com http://w4zt.com GS-35B Triode Grounded Grid Linear Amplifier Project For Amateur Radio by W4ZT (Latest update done on July 6, 2008 ) WARNING! DANGER! HIGH VOLTAGE! This project uses dangerous high voltages. These voltages will not just shock you, they will kill you. Use extreme caution while building, working on and testing. Always THINK SAFETY ! Only YOU can prevent accidents. Circuits Construction HF Links Mail Archive Parts Lists Q & A Tube Data VHF, UHF, SHF Manufactured at the "Souz" (Union) factory in Novosibirsk, Russian Siberia GS-35B Medium mu triode vacuum tube Click here to compare the basics between the GS-35B and the 3CX1500A7/8877 Tony’s first rule for tubes: Tubes are like women... If you feel that you must have two, keep them in separate houses, and don’t let them know about each other. If one isn’t good enough for you, get a better one. In other words, if one tube isn’t enough for you, don’t run two, get a bigger tube! The next logical step above a single GS-35B isn’t two of them... it is a single YC-156 Pozy’s first rule for building home brew amplifiers ( http://k4poz.w4zt.com ): "If your amp is going to require more than 100 Watts of drive, you need to get a different tube." My Own Links and General Amp Information: W4ZT Socket - This is my GS-35B tube socket or mounting fixture design. It virtually eliminates the stray inductance in the grid circuit. Click on the picture to see the details of the construction. The socket to the right has my *Teflon® Chimney in place. I make and sell Sockets, PTFE Chimneys and Bias Boards: Sockets for the Russian GS-35B Triode Transmitting Tube and PTFE Chimney Sockets for the Russian GI-7B Triode Transmitting Tube Bias Boards for direct two wire replacement of zener and silicon diode strings. CAUTION: I have documented proof that there is a problem using PVC as a chimney. CLICK HERE for pictures and more information. Tube Tester and Filament Burn In Jig - Here’s my answer to cooking the tubes for days and then testing them before inserting them in an amp . Note - I have learned an important lesson with this jig. The filament alone heats the entire bottom of this tube and even with the fan blowing air into the box, the bottom of the tube will get too hot to hold in your hand. This is an important lesson regarding cooling of the tube, particularly the grid ring and filament seals. Do NOT run this tube without air, lots of air, blowing around its base and through the anode cooler. There is 38 watts of heat from the filament alone. W4ZT GS-35B Tubes Glow In The Dark! - Pictures of GS-35Bs glowing in the dark producing a rainbow of color. Do yours glow? My bet is that they do. What color are they? Want to share your pictures? Schematic of the GS-35B Amp - An effective simple schematic. NOTE: Do NOT use a center tap filament transformer. To do so leads to unbalanced currents in the filament choke and hum modulation of the RF output. Instead, use a separate cathode choke. Note that the filament choke can be made with two 48" long pieces of #18 wire bifilar wound to fit on a 3.5" length of 3/8" ferrite rod. The cathode choke can be one 48" length of #18 wire on a 1.5" length of 3/8" ferrite rod. Both chokes are about 25 to 30 uH. Be careful to wind the chokes on a metal rod slightly smaller than the ferrite and then move them to the ferrite rod to prevent breaking the ferrite. Show and Tell GS-35B Amp - built big and open to show everything inside except the cathode compartment. A work in progress. Ohm’s Law PIE Chart - trouble with Ohm’s law? . Tubes, Parts, Information and Sources: Max-Gain Systems - Allen Bond has Vacuum Relays, Vacuum Variable Capacitors, Turns Counters, Fiberglass and many other hard to find RF Transmitting Components. High quality components and the best service: http://www.mgs4u.com QRO-Parts.com - GS-35B Tubes via Texas or direct Nice new old stock tubes in the foam box available at reasonable prices plus shipping charges from Russia. He also has the GI-7B, a large selection of vacuum variable caps, vacuum relays and other parts for the QRO builder. Payment and shipping can be made in the U.S. via storage in Texas. http://qro-parts.com/ Frank’s Electron Tube Data Sheets - Frank’s got a huge resource of tube data: http://frank.pocnet.net/ Almost All Digital Electronics L/C Meter - If you are going to be building an amp, this tool is invaluable. You need to be able to know what value your capacitors and inductors are and to be able to wind coils as needed: http://aade.com/lcmeter.htm Anthony Welsh - Supplier of tubes and other components: http://anthonywelsh.com/ W4TH - Tom Hix - TomsTubes in Boaz, Alabama Tom passed away in December 2006 and Tom’s Tubes is no longer supplying tubes. Rest In Peace old friend. Tubes.ru - A good listing of many Russian Tubes, specs etc. http://www.tubes.ru/ G8WRB - David has a nice collection of tube data sheets and lots of other amplifier and electronics information: http://www.g8wrb.org/ GSTube.com - carries a huge selection of tubes, sockets and other components from Russia: http://www.gstube.com/ WD7S - Paul sells a triode control board, a digital meter display, a tuned input board and other components: http://home.earthlink.net/~wd7s/triode_control.htm http://home.earthlink.net/~wd7s/ ( old address - http://wd7s.home.att.net/triode_control.htm) GM3SEK (G3SEK) - Ian sells a triode control board and a tetrode control board too: http://www.ifwtech.co.uk/g3sek/boards/triode/triode-1.htm http://www.ifwtech.co.uk/g3sek/ YL2QM - Russian Tubes, specs, sales etc. http://www.kvindesland.no/yl2qm/tubes.htm KK5DR - Matt has lots of amp builder stuff on his site. Makes for some excellent reading and well worth your time. http://kk5dr.com/ Please take the time to read his amp builder document here: http://kk5dr.com/ampbuilders.htm More amp stuff, lots of links http://www.geocities.com/ko4nrbs/ AC6V ’s Tech Ref http://www.ac6v.com/techref.htm WB0NNI - Amp design for tetrodes but LOTS of good information. This site is loaded to the gills with good stuff. http://wb0nni.dakotamade.com/rfamp2a.html (N4JML) Amplifier basics including vacuum tube basics, "Good stuff for amp beginners like me" Rick: http://wb0nni.dakotamade.com/basic.html (KC4HYM) Be sure to click the link for Grounded Grid Basics too: http://wb0nni.dakotamade.com/ggbasic.html KD9JQ - Ham Radio Page for Homebrewers Was at this address http://mywebpages.comcast.net/kd9jq/hamradio/kd9jq.html but Chuck changed his ISP to MSN. MSN wants you to sign up to view his pages so they are no longer available by direct link. You can still view this page by using the Wayback Machine at http://archive.org which will take you here: http://web.archive.org/web/*/http://mywebpages.comcast.net/kd9jq/hamradio/kd9jq.html Triode Amplifier Program - design your own Chuck’s program was here http://mywebpages.comcast.net/kd9jq/hamradio/TAP.html but now can only be seen by using the Wayback Machine at http://archive.org which will take you here: http://web.archive.org/web/*/http://mywebpages.comcast.net/kd9jq/hamradio/TAP.html AG6K - Rich has lots of amp building info on his site. Years of experience and knowledge to share. See the pictures of the ugly amps, etc. There’s a great multi-part article on amplifiers that he put together for the ARRL Handbook. Read, if you dare, about Richard Measures’ clash with ARRL over his writing about amps, advertiser control of QST and other interesting stuff. (W4BD) http://www.somis.org/ F1FRV - Dominique has nice logic, control and metering circuits and cards and lots of other amplifier info including pi-networks and testing of tubes. Main page - http://f1frv.free.fr (click on Linear Amps) Other than by band, these links are provided in no particular order. Thanks to everyone for your links! (click on the links or the pictures for more information) HF Amps: Schematic of the GS-35B Amp - An effective simple schematic. NOTE: Do NOT use a center tap...