[Amps] 2M GS-35b Anode impedance

[Steve Wright]

Thanks EVERYONE for your help!


Steve


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" <stevewrightnz at gmail.com 
> <mailto:stevewrightnz at gmail.com>> wrote:
>
>     Gurus!
>
>     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.
>
>     Steve
>
>
>
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