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I really appreciate the the helpful comments from everyone especially laatsch55 and gene french ( this is supposed to be a helpful forum for DIY repair ...right? ). WOPL Sniffer must be trying to sell WOPL boards or just plain needs everyone to do what he wants, that's why the fear mongering and...

So are you saying that you don't know if the Idle current can simply be referenced off of the emitter resistors reliably?

Yes they work just fine , no overheating, no degradation on signal.

correction ...2n2222a

I understand all of that with the bias transistors. I swapped them out with 2N222a's temporarily with absolutely no effect, same same. I realize those are not exact matches but one would expect even a slight change in behavior by doing that...no? As stated in my original post I have between 3mv...

These aren't my amplifiers I'm fixing them for a friend and he does not want to do the WOPL. These will both work fine when just plugged into full AC so my only remaining question is... does it really matter if the idle current sets up differently on these two production runs? So to recap..the...

Nope not full complement, I just fat fingered the number. They are quasi and MJ21196G. the rail voltage is approx 83.5V and the same negative.with no AC ripple.

Hi all, Appologies in advance for the long winded post but I'm having trouble (or I think I am) with 2 PL 400 Series 2 amplifiers. I have 2 of them and they are both acting differently when I bring them up on a variac. Both had shorted output transistors (caused by apparent over tightening of...

Thanks, I think I'm going to leave those out.

Thanks laatsch55 and all for the great welcome. Just for clarity you are referring to the C11 in the pic included here with the cathodes directed towards the + side of the cap I would imagine? Can anyone explain how this prevents the + rail from latching up? I'm super confused on this one.

Hi All, I just signed up here and not quite sure where to post my question about a Phase Linear MKII repair/verification of a mod I found. I'm rebuilding an PL 400 MKII and I can't remember where I found this mod and need some clarification, all I did was copy past it. If anyone has done this...