« Last post by vwyf11 on March 30, 2026, 07:18:47 PM »
No, the voltage from tp3 to 0v is not stable. It bounces around from -10 to -12.5 very erratically. I’ve tried tapping around and checking at each component or the pcb but nothing seems to directly affect the erratic nature of the voltage readings. It seems it’s getting even worse. The readings are jumping instantaneously from 0v to 4.5v when measuring between tp2 and tp3. Measuring the voltage at the card extender is a steady 15.5 volts + and -
« Last post by JPK on March 30, 2026, 11:19:39 AM »
The diodes D10, D11 on the front PCB have no effect on the the output stage bias setting. Is the voltage on TP3, against 0V stable, around -11.5V ? Is the bias voltage bouncing when you tap the PCB or specific components with a pen ?
« Last post by vwyf11 on March 29, 2026, 07:42:40 PM »
When I installed the diodes I was able to get a solid 3v between tp2 and tp3. After this step I had double checked the next day and am back to not being able to get a steady 3v from tp2 to tp3. The meter bounces around from 2.4 or so volts to 2.8v. I cannot even get to 3v anymore. I’ve ripped everything apart and double checked everything now. Tried reflowing parts, nothing seems to be working.
The voltage from 0v to V+ and V- both give me steady correct voltage.
All the other tests on the page you link to are giving me results in the ballpark for the required voltages but all fluctuate around 0.25v up or down from the target voltage
« Last post by Ben on March 26, 2026, 06:40:57 AM »
I am only getting 0.152v ac on the output when engaged. I believe the transformer is oriented correctly and solder joints appear clean. I am getting 0.14v ac @ U2 pin 4 and U2 has power. I hear the relay click when taking out of bypass. I also tried cleaning the tube pins. Please advise, Thank you +15.6 v -15.56v B+ 45v tube heater 6.15v and glowing
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