You should probably add that this is for TUBE AMP troubleshooting and explain what could happen if you try this on a non-tube amp :)
I think you need a Blocking Cap maybe .1uf/600VDC to do this safley in ANY AMP.
quite a informative video 👍
On the plate of those valves there is going to be very high voltage.. you’re definitely going to need a dc blocking capacitor in series with the prob 👌
I have a driver transistor on a power amp that distorts the the sine wave signal into a sorta noisy stair step pyramid. I have changed all the caps. What could cause this. The following transistor driver is a lot worse. The output to the speaker Looks like its only amplifying the negative swing of the signal. Bad bias resistor? Bad transistor?
Good tutorial with a very important caution at the end.