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Re: [Amps] 2M GS-35b Anode impedance

Subject: Re: [Amps] 2M GS-35b Anode impedance
From: Steve Wright <>
Date: Thu, 24 Dec 2015 17:15:07 +1300
List-post: <">>
Thanks EVERYONE for your help!


On 23/12/15 13:40, jeff millar wrote:

3650 VDC is a good voltage. Anything up to 4000 is routine. You're right that gain depends strongly on voltage.

I built a 432 amp with a bit under 3000v at load and it has low gain.

Jeff, wa1hco

On Dec 22, 2015 9:08 AM, "Steve Wright" < <>> wrote:


    I see a wide variation in anode volts on GS-35b designs.  The
    pattern seems to be lower Va on VHF, higher Va on HF.

    A trend I see, is lower gain on lower Va (2200Va/10dB) and higher
    gain (4000Va/13-14dB).

    I'm building a 2M VHF amp with this tube, and I already have a
    3650VDC supply that will deliver 1A.  I would VERY much like to
    dual-band this amp on 6M, if I could manage that.  There are a few
    publicly-available designs doing the dual-band trick.

    Any insight?  I'm not foolish enough to think I know better than
    Drago et al, so I am reluctant to abandon the many recommended
    designs and depart from clearly stated numbers, especially
    exceeding Va by 50%

    I only have 100W drive (TS-2000), so I would really like to be in
    a position to be able to (or have to) reduce drive for the safety
    of the amp or the power supply (or the coax lol), or at the very
    least not be in the opposite scenario with not enough drive and
    everything running stone cold.

    Many thanks for your engagement.


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