>
>on 5/9/01 9:36 PM, measures at 2@vc.net wrote:
>
>>> Might be a good idea, this doesn't usually change stability much
>>> because the feedback mostly involves the grid and layout more
>>> than anything else. But it sure affects efficiency and even IMD!
>>>
>> ? In our parasitic suppressor retrofit kit for the 3-1000Z, we provide
>> VHF dampers to connect from the filament pins on the socket to gnd.
>
>These R-C networks on the filaments do help. They stopped an oscillation
>for my amplifier. One person suggested though that they may have helped to
>stop an LF or HF oscillation rather than a VHF one. I have no idea and I've
>not thought it out as adding these took care of the problem (similar to that
>of the original poster's but not as severe.).
? They could not possibly have much effect at HF because the damper's
capacitor is self resonant at c. 190MHz.
cheers, Jon.
- Rich..., 805.386.3734, www.vcnet.com/measures.
end
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