Voltage problems

[Paul Birkeland]

That's not significant.  If the writing still says 1N5820, you're good to go.

Unplug the tubes from the sockets, then briefly measure the voltage at C1/C2 (IE - get your meter probes attached, plug the amp in with the power switch already on, check the voltage, then unplug the amp)

 

[guf]

The voltage with the tubes out and my clips at c1 and c2 was 8.6.

thanks

 

[Paul Birkeland]

Ok, good info, now do the same thing with one tube in socket A and no tube in socket B, then with one tube in socket B and no tube in socket A.

-PB

 

[guf]

socket a (and no b) 6.92
socket b (and no a) 6.88

 

[Paul Birkeland]

Alright, things are looking very good so far.

Try the same test with the other tube.

 

[guf]

oh i did. 

socket a was 6.86
socket b was 6.88

 

[Paul Joppa]

Then you have no problem.

Most of the voltage measurements on the heater power supply are a combination of AC riding on DC, and different meters will read them differently. Your heater voltages at the tubes are OK (they are a half volt high with one tube, which will come down with both tubes installed), and the tubes glow properly (indicating they are getting the right power) and the power transformer isn't vibrating noisily (indicating all four diodes are working properly) so enjoy the tunes!

 

[guf]

awesome paul thanks!