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Electronics => RF, Microwave, Ham Radio => Topic started by: Jesset1996.5 on November 17, 2016, 04:23:33 am

Title: Best amp tube for low rf output
Post by: Jesset1996.5 on November 17, 2016, 04:23:33 am
Hello, i am looking for suggestions for what tube i should use in my linear amp project. I have some radios that have a max of 30-40watts and id like to make a legal limit amp for them. I have all the other bits and pieces figured out except for which tube/ tubes to use. Im looking for a tube with a decent price and is readely available that can provide that kind of power. I was also looking to use GM3SEK’s controle board which can be used on either a triode or a tetrode. Amp will be used for 1.5mhz to 30mhz. Might even go to 50mhz while im at it. I have looked online at designs but id rather have other hams opinions.  Any and all suggestions are much appreciated. Thanks AC8WP
Title: Re: Best amp tube for low rf output
Post by: Chris Wilson on November 17, 2016, 11:23:55 pm
GS35B?
There's a very simple one described and even available in kit form at http://f1frv.free.fr/ (http://f1frv.free.fr/)

Main costs are a safe HV setup and the cost of known good vacuum variables, but a tube is a lot more forgiving than a semiconductor ;)
Title: Re: Best amp tube for low rf output
Post by: Jesset1996.5 on November 18, 2016, 03:48:16 am
I could probably use 2 gs32b tubes. I was thinking of coppying this build.  http://jetpropulsion.co.uk/gw0fzy-amateur-radio/gs35b-hf-linear-amplifier (http://jetpropulsion.co.uk/gw0fzy-amateur-radio/gs35b-hf-linear-amplifier) . It uses 1 gs32b but requires 85w drive to provide 900w. I could use 2 i guess and double the output with 30-40w drive.