Crack w Speedball, Final Voltage issues [resolved]

[jonathan.lesser]

Prior to Speedball, all voltages good, sound good.

After Speedball, Noise and no music left, right great

Following voltages:
OA: 62V
OB: 99V
G: 0V
B+: 176

All LEDs on

Thank you

 

[Paul Birkeland]

What are the voltages on the front C4S board?

 

[jonathan.lesser]

Thanks so much Paul!


Terminal one: 64 V

Terminal 2: 185 V

Terminal 3: 0 V

Terminal 4: 185 V

Terminal 5: 0 V

Terminal 6: 0 V

Terminal 7: 102 V

Terminal 8: 0 V

Terminal 9: 66 V

Terminal 10: 0 V

Jon Lesser

 

[Paul Birkeland]

Was terminal 5 0V when you first installed the front C4S board?  When you resolve why terminal 5 is 0V, terminal 9 will move to what it's supposed to be.

 

[jonathan.lesser]

Yes Paul, all voltages were spot on for the initial crack build

 

[Paul Birkeland]

If you remove the 6080 and just run the amp with the 12AU7, does that voltage at terminal 5 increase?

 

[jonathan.lesser]

Thank you, Paul, I will try to do a deep dive over the next couple of days to answer your question regarding the tubes and to focus on problems I may have caused during the upgrade. Thank you so much once again for your enormous expertise.

 

[jonathan.lesser]

All fixed! Found something dumb and addressed it. It sounds glorious and I appreciate your expertise, Paul, plus your endless patience.

Jonathan Lesser.

 

[Deluk]

Dumb or dumber, please let us know what you found. We all make mistakes or do something silly now and then.