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The criteria I use was from Joes instructions to "test for no shorts to the chassis." You are right, I don't have all the tools you do. I'm just a hobbyist enjoining my amp. More pictures showing my progress.

All the transistors are mounted in the back panel in a new TO-3 socket. Each one was tested to ground before proceeding to the next.

Thank you..

Is a Film Capacitor and a Metallized Polypropylene Film Capacitor interchangeable? OfCourse all the spec matches.

I'm on a small pause. Have transistor sockets on order.

I have to take that as a complement. This is board #3 for me. Thank you!

Control board completed. Front and back.

I;m going to fine it now and read. Pick up some pointers from the pros.

Yes, it does. I am going to rebuild the back wall to full comp, hard wired, since no back board replacements exists. Already have all power transistors from White Oak and other parts from Mouser Electronics. I'm also replacing the control board with duel mono board from White Oak. Building it...

Relay board completed this morning. Moving ahead!

I noticed the heat sinks have a purple color to them. Overheated at one time?

I think this is as far as I'm going tonight...

I spent 2 hours this morning stripping down my chassis. And then sent the rest of the day removing all that thermo paste that gets everywhere. Whoever put the amp together had a deep spoon. paste was thick. All cleaned, will work a little more later this evening.

Pulpmillguy I think this will answer your question. I cannot put meter to terminals as fuses are blown.

As everyone can see, the inside looks like a PL 400. Just noticed, the power capacitors have been replaced. Looks like the same size as factory.

George, This is what the meter board looks like. Not close the Joes boards. If i have to it just will not have meters.

Next project will be a Carver C-500 amp. Going to rebuild the back wall to full comp. (Back wall parts already arrived. Power transistors by Joe.) Going to replace the bridge rectifier with snubber capacitors with Joes kit. Going to replace power capacitors with Joes kit. Going to replace the...

All, I now have 2 Phase Linears 400 WOPLed under my belt. Everyone says you'll get hooked on this Hobbie. Correct! I have a Carver c-500 to start next. Looks very similar to the inside of PL400. Does anyone mind if I start on this amp with the same help from everyone? Do I continual with this...

Joe Can you please respond to "Power Transistor Help" post #181 with your response. Sorry for changing subject.

Will it be rack mount friendly?