02-12-2026, 04:29 PM
See if switching tone control (BTW have you replaced the cap...39? is it?) changes the pattern.
Also, put a Voltmeter between the chassis and the plate of every tube starting at the 42 tube, and see if you see large voltage oscillation (an analog meter is better at this, more visual) at that plate. Move back tube by tube, see where it originates.
And. Remember this (I try to explain it to everyone): troubleshooting BEFORE the full recap is a waste of time.
So, pick one backelite, unscrew it, turn 90 degrees, see if it is re-stuffed. If not, well....see the above.
Also, put a Voltmeter between the chassis and the plate of every tube starting at the 42 tube, and see if you see large voltage oscillation (an analog meter is better at this, more visual) at that plate. Move back tube by tube, see where it originates.
And. Remember this (I try to explain it to everyone): troubleshooting BEFORE the full recap is a waste of time.
So, pick one backelite, unscrew it, turn 90 degrees, see if it is re-stuffed. If not, well....see the above.
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
