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My order is Power On: Pre-amp, then WOPL 700B (with DC protect) second Power off WOPL 700B, then preamp If I power on 700B before preamp I definitely get a turn on thump from the pre. If you are running a Phase Linear power amp get a DC protect board installed.

Congratulations, first song?

Oh and I am driving 4 ohm speakers with efficacy rating of 90db, so I need the power of the 700b.

A wise man once said….. “Spare??? Never heard of such a thing”

If this were going into my system as a daily use, it would be upgraded to all White Oak. As it is it will sit on a shelf waiting to be called up if my White Oak 700B need work.

Amp is back together and sounding great, I am going to replace the meter light board with Joe’s LED board. Should have ordered everything from Joe all at one time. $200 for the amp $95 new output transistors $71 storage caps $125 relay protection $65 meter board $556 plus my valuable time...

Kidding aside, next time I will remove the bottom cover. thanks

Regarding the papaer towel, if you know the rules, you can break the rules. I was very cautious with the board. Also the paper towel was doubled up, lol.

I saw that later, bias/bios, the amp sounds great!

Finally got to powering up the PL400. Replaced blown fuse, I powered it up via a DBT with all of the output transistors removed. All seemed well, so I installed a single row of new outputs. DC offset next to 0 (less than 10mv). Bios high (.5v) but would adj down. Sent 1000hz tone through the...

If it’s not an issue, go ahead and add the caps, send invoice and I will pay now. thanks Joe! if things are posted up and weighed, separate order is fine.

I ordered replacement output transistors from Joe. When it is repaired I will then order a DC protect relay and new power supply Caps. May drop Joe a message and add the caps to the transistor order.

Cleaned off the bench, fired it up with a dim bulb tester. Short to the outputs, meters pinned and 50 VDC on the speaker out connectors. took the transistor covers off, pulled the top three rows, left the drivers in. The output transmitters were all PL909, two were shorted. They were all...

Nice guy, he had another 400 SII in his system. i already own a "spare" 400, didn't need a second spare 400, but couldn't pass on this one. I guess that's how we gather a heard of amps.

Saw a face book post that Ed "liked", saw it in my feed. Had to purchase it. The amp was the 8 fin 400 listed in Derry NH for $200. Amp is mint looking, listed as non functioning. Will get it on the bench soon. Doesn't look like a screw has ever been removed from the case.

Welcome to Phoenix, I am sure someone here has what you are looking for.

What speakers, and do Both behave the same way? Try and download a tone generator to your phone/iPad and sweep across the freq and see is you can isolate the freq that you hear the buzz.

Transformer leads do not have a hot and neutral, your choice on which one goes where.

I would need Ruth

135db is loud, what bands were running that volume, also who is limiting concert volume? What country?