sookwinder wrote: ↑Sat Mar 02, 2019 8:05 am
-Also, there was some oscillation between 1.9V and 3.5V on the lead coming off the 25 MGD capacitor going to pin 8 of V2
what are the voltages like at pins 1 and 6?
Do they oscillate as well.
what about the voltage at pin3?
What time period is the oscillation?
1 sec
0.1 sec
10 sec?
So, I replaced V2 as soon as I got home on Friday and the amp could not sound better. I checked the voltages tonight and here’s what I got:
-Coming off of the 25 mfd cap in question (the one going to pin 8 of V2, I got a steady 3.5 V when the layout calls for 2.4. No oscillation. The other day, with the old tube, it was oscillating at the rate of about 1/2 a second, or so it seemed. Now, steady as can be with the new tube.
-on that tube itself, I got:
Pin 1: 245 V (should be 230V)
Pin 3: 0V (bad reading? What should I be seeing?)
Pin 6: 242 V (should be 230V)
I think all is well. The amp certainly sounds awesome. I may be able to score some old RCA or Telefunken tubes from my coworker that I know have tested as A-OK, too! Wouldn’t that be nice?