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Now I got my control board built and installed in the amp. Powerup went good, nothing smoking or blew up. On full line voltage now. Bias adjustments not going so well. Left Bias adjustment reading .000 no matter where adjustment is. Right Bias adjustment reads .156 constantly no matter where...

Ok, thanks Joe, will do.

My control board kit came in today, well Thursday.

I'm 100% believer on high heat on these boards, they are very robust and built well.

Well, I'm taking my time and being patient about it. One has got to be even after getting the Backplane boards in the chassis to find out, one has to pull it all back out, fix what was over looked. Lesson learned on my part. I believe you when you say worth it.

Ok, I got the boards back in after re-soldering all the PEM's, and all other components with good solder flow. Made sure to run a 6-32 tap through the PEM's before reinstall. This time, no issues with output Transistors screws not going all the way through PEM's. Got the powerups to go without a...

It was about a year ago when I did these boards, if my memory is correct, I had my solder iron set at 750 degrees. Maybe flux and solder flow was wrong.

Ok, definitely will pay more attention to heat, flux and solder flow.

Well, I guess I made that a lot longer answer than it should have been, sorry bout that, Perry...……...

In the pic, I show one output with a screw that has washers under the screw head to hold the output transistor down, because the screw stopped short of going through the pem. This is the one I have to re-tap and fix, and check all the other pem's. Just the one is troublesome. Also do some...

I will remove the boards, I don't want to chance solder chards and taping shavings getting in behind the boards or anywhere else. Will be easier to do the job.

Thanks roccus and NavLinear for pointing out the solder joint on both sides of the boards need solder, makes sense. I will do that tomorrow. I will do all my boards in the future that way with through holes.

Great idea, I will locate a 6-32 tap. I don't like the washers under the screw head.

My powerup's went as: L board +83.7 -83.6 output/ground 0.0 R board +83.7 -83.5 output/ground 0.0

I did not get one PEM soldered correctly on the back of the left board. PEM is in the board straight, but the solder must have been a cold solder. I did the first powerup, went well. Got to the point, it's time to install to second row of transistors. The top screw on the XQ5 location on the...

I have been fallowing this thread for a while, glad you got it going. Series I 400's look great with rack handles, I got series II style rack handles on mine...…..

I did read the description, can not believe they actually plugged it in. Anyway, getting back to the Thread, you do fine work, although I have never heard any amp's you build. The boards look great. Now I got to get back to my truck ramp, I mean finish my WOPL 400 build in the works for a year...

I think someone stole block from under your truck..... https://www.ebay.com/itm/Phase-Linear-400-Series-II-Amplifier-As-is/283390021762?hash=item41fb5c9082:g:UfYAAOSwxlxcbtyx:rk:3:pf:1&frcectupt=true

Was they rare in this silk screen and face color?

Is this a real purple face PL700 from the factory? https://www.ebay.com/itm/VINTAGE-PHASE-LINEAR-700-PROFESSIONAL-STUDIO-AMPLIFIER-700W-RMS-INTO-8-OHMS/382787678067?hash=item591fec6f73:g:8wkAAOSw2cRcZfGm:rk:47:pf:0