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It may be that Hexis removed one of these when he converted Gibby's original PL700, as he did a complete chassis conversion as part of that effort. Worth asking.

Hey Harold, glad to see that Linda is good for another 50 years...time to enjoy your nice work.

I heard that there used to be a wall in the near end of this picture that is no more...

One owner from a smoke free, pet free home...we know you love a project Kyle.

Yes that dining room table rental is $500/month...

You should use it to prevent it from gathering dust Mark...

49k input impedance and yes, absolutely

WO Design schematics are proprietary and not for posting on open forums...sorry about that.

No, the germanium devices need to stay germanium for the current limit to work properly.

And it has the earlier billet knobs...

Or get a real board with capable devices on it rather than those marginal TO-5 devices :-)

Use the 2N3439 and 2N5415. On your Q4 question, none of us were there so we would only be speculating. Q4 is a low voltage application, vs. Q3 which requires a high voltage device. Beyond that?????

subtitles....arrrgh

And remember, 'nothing we do here is wife friendly'

How far into it are you Fred?

Twins...very nice.

There is one other very big downside to quasi comp operation that plagued PL throughout their entire quasi comp life. It is a bit technical to describe. That is that the TO-3 can is the collector. On the negative half cycle, where NPN devices were used to emulate the PNP devices that they...

Put a temporary jumper between the bias transistor C-E, that should zero your bias. If it does, the issue likely resides in your bias transistor. If it does not zero it, then your issue is elsewhere. It is important to note that it is perfectly safe to run your amp with a shorted C-E on the...

R41, the 0.22 ohm resistor on the back wall may be open. You should check.

Please include a snippet of the schematic you are referencing for the R25 callout. PL has many schematics, none very consistent. We want to get to the heart of the matter without a wild goose chase. 0.550 bias is not a good situation. Likely caused by a defective Q7 or Q10 on the control...