okay replaced the zener with NZX15a. only getting 4.5 volts across it. as well as 4.5 on the emitter of Q71
Does the zener voltage go to 15v if you pull Q71?
What's the DC voltage on the collector of Q71?
What's the DC voltage on the collector of Q71?
15.5v after pulling Q71 on the zener. and collector voltage is 3.52v reading from Negative rail to collector.
According to my notes, you should have approximately 25v on the collector. Check the resistor feeding the collector of Q71.
Okay. the 1ohm resistor that was feeding the collector was way out of tolerance. Dont know why I didn't see it when i changed the zener. That was rookie.
And powered up checked voltages and got sound from the speaker. Almost scared me. Now has 14.9 to the driver board. I can see the drive signal now. And sound.
Ran the amp through the scope with the generator driving it, ran it up to clipping and getting the full 105 volts through.
Thanks again Perry. Sometimes we need a eye opener. You the man.
And powered up checked voltages and got sound from the speaker. Almost scared me. Now has 14.9 to the driver board. I can see the drive signal now. And sound.
Ran the amp through the scope with the generator driving it, ran it up to clipping and getting the full 105 volts through.
Thanks again Perry. Sometimes we need a eye opener. You the man.
I dont have the amp anymore. I do not have my records from then. lost the computer.
You may want to start a new thread and ask.
You may want to start a new thread and ask.