[Amps] Parasitics & Filament Sag

[R L Measures]

On Sep 1, 2006, at 7:06 AM, Steve Thompson wrote:

>
>
> R L Measures wrote:
>
>>> I hope not, I looked from 1MHz up to around 300MHz, in both full   
>>> and
>>> part band sweeps. Around the tuned frequency was the only place  I
>>> found repeatable signals. It's a laborious process as a spectrum
>>> analyser (at least the ones I have) is unsuited to catching a short
>>> duration signal.
>>
>>
>> Switching the amp between Tx and Rx at a 5Hz rate

> If/when I ever look again, I'll try that.
>
> and disconnecting  the
>> RF input coax might help.
> I didn't have anything connected to the input for any of the tests.

And you were able to see the HF fundamental signal at the anodes.
>
> Steve
>
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R L MEASURES, AG6K. 805-386-3734
r at somis.org