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[Amps] 2M GS-35b Anode impedance

Subject: [Amps] 2M GS-35b Anode impedance
From: Steve Wright <>
Date: Tue, 22 Dec 2015 15:31:43 +1300
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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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