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I had this issue once. Leaving the dbt connected, I took the variac out of the system and powered up. Everything was groovy after that.

Very impressive!

The P3600 arrived this morning. It was the best packing job I've ever seen. A heavy duty box containing the original Phase Linear box. Advertised as "Open box new unit", I was skeptical until I opened the box. To my amazement, there it was, just as it was packed in 1982. If it were a baseball...

Thanks bud. The voltmeter was like $11 on ebay. :) So far so good with the Yihua desolder gun. I found the trick is to let it heat up real well and draw the old solder in while poking it with a supplied wire. After that, it seems to be OK. I haven't used the Hako, but I hear they are great.

love me my DBT! Thanks!

Thank you sir!

Anybody have a scanned service manual they could share? Can't seem to locate one out there

Opps, I did it again. I purchased a new in the box P3600 preamp. Waiting for it to arrive/survive shipping. There really aren't many threads on the internet regarding this preamp, but the ones that exist seem to like it. Any observations from the peanut gallery? I'll be able to compare it to the...

Was a thought, but nah, I forgot what it was.. lol. I run a cheap set of Memorex speakers for raw testing, then up to some Neumi's, and then over to the living room and the JBL L7's, or AR LST's. I did have a blown resistor in one of the L7 crossover tweeter circuits, but it just kept signal...

Turn it up to 11! Perfect bias set at .360 and holding after a half hour. Thanks sooo much. #6 is finished.

Thanks, I'll report back...

Indeed. R38 is going in as we speak. I was chasing a high bias issue. Thanks for the eagle eye!

Yup, full comp. And here is a screenshot of the test set up I am following. Sorry, I should have posted it so you didn't need to go digging. I'm just trying to out do Gene on leaving R38 out. lol

I've set up PL400 #6 to run the above test from the WOPL docs. Before I put the juice to it, I wanted to make sure it is set up the way suggested in the docs. Joe, If you have a minute, could you confirm this is set up right? Thanks! Richard

Testing between TP1 and Pad 9 shows 151 Ω as it should. I don't see a 10 Ω resistor like in the original PL backplane. I'll try warming it up and retest, thanks for the ideas. Ω

Same parts I found "browned" on the PL36 board I just replaced with a WOPL board. I replaced the parts, but they still heated up to an unacceptable level. Keep track of the orientation of the Diodes. I seem to remember having a question about that with the PL schematic vs what I found installed...

Going back and forth between the test points with a single multimeter gives me the results I listed. I used both a cheapo meter, an Ames DM1010, and for fun, the Triplett 630.

Yup, full boat. led board, backplane, filter caps, rectifier, output relay, yada yada,, :)

Amp 1, the one I stupidly allowed the left meter to touch the buss bar, is finally back up and running properly, mostly. By mostly, I mean the only issue I have is the left channel bias adjustment only has a range of .21 to .33, the right channel has a range of .22 to .43 or so. I matched both...

5 down, one to go. Thankful for the help from everyone !