VHFtubeamps : VHF UHF Tube Amplifier Builder

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VHF UHF Tube Amplifier Builder

This group is for anyone interested in exchanging information about building amateur radio tube amplifiers for the VHF and UHF bands.

AS well as the Russian tubes (valves) including the GS-31, GS-35, GI-7b and GU-74, members of this group build amplifiers with US tubes including the 2C39/7289, 4CX250B, 4CX350, 3CX800, 3cx1000 and 3CX1500/8877.

The exchange or sale of difficult to find tubes and amplifier parts in this group between members is positively encouraged!

Please visit the links, photos and file area of the group for information about tube amplifiers.

Please note that these amplifiers use very high voltages which are likely to kill you or anyone else who comes into contact with them. Advice is given by members of this group in good faith but you act on it entirely at your own risk. If you are not absolutely sure what you are doing then please do not attempt to build a tube amplifier. You don't get a second chance with these voltages.

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Re: W1SL Deck Hi Stewart Almost certainly yes. The 350 has about 1pF more of output capacitance which should be within the range of the plate tuning flapper. I can't think Posted - Fri Dec 16, 2011 8:15 am	Paul Whatton pwhatton Offline Send Email
W1SL Deck Moving-on from the HVPSU problem, I have another query. Can 4CX-350s be used in the W1SL deck in place of 4CX-250s,without any mechanical changes to the anode Posted - Fri Dec 16, 2011 6:57 am	gm0gtu Offline Send Email
Re: Re=3a=20=5bVHFtubeamps=5d=20Re=3a=20W1SL=20PSU=20Re=2dbuild Hi Paul, I think I have the smoothing capacitor sorted; thanks for the help. I'll let you know the outcome. Stewart Posted - Fri Dec 16, 2011 6:53 am	gm0gtu Offline Send Email
Re=3a=20=5bVHFtubeamps=5d=20Re=3a=20W1SL=20PSU=20Re=2dbuild Hi Stewart Have you come across PSUD2? http://www.duncanamps.com/psud2/index.html It's fantastic!! There are models for strings of IN5408s already in the Posted - Fri Dec 9, 2011 1:50 pm	"Paul" pwhatton Offline Send Email
Re: W1SL PSU Re-build Hi Paul, Thanks for your reply and links to the photos. I'm curious about you using 50uF of smoothing capacitance. I understood that around 30uF was the Posted - Fri Dec 9, 2011 10:37 am	gm0gtu Offline Send Email
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