[AMPS] Chasing undesired oscillation, query...

[Bob Duckworth]

Say I have my tube all wired up and wonder if
I've got any unwanted positive feedback.

With the amp all assembled I stick some
white noise on the input. Just a little, say from
one of those Palomar antenna tuner tuners.
Now I sweep the range where the tube has
gain listening with the receiver. Won't I hear an
increase in the noise level at the frequencies
where I've got some feedback???

The triode in my little regen RX behaves this way.

-bob



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