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This isn't mine, but I bid on it for a while until I gave up at over $1200. http://www.ebay.com/itm/Phase-Linear-Dual-500-with-rare-wood-kit-/321347747135?pt=LH_DefaultDomain_0&hash=item4ad1d17d3f

That's been my search criteria on mouser. I can find some with close to the same capacity as these, but they're almost half as tall...

The 4558s do seem to have failed on both amps. When I pulled them, the 15v rails stabilized (previously all over the place and causing the 3k 5w resistors to run scalding hot) and Hi-Freq lights went off. I went ahead and took an inventory of all caps and opamps, and ordered new+extras from...

BTW, the D-500 uses the PL-32 driver board.

It looks to have heat damage, but I suppose that doesn't necessarily mean failure. What opamps are recommended nowdays?

Another suspect component: Photos from amp1 and amp2 - same damage to both.

3K. I'm about to remove the D101 and test it. Here is another photo I forgot to take earlier; the output and driver transistors:

R101, I think.

Schematic from the original owner's manual (attached)

I made it home today and was able to power up both amps on a Variac. I didn't test any audio input or output, but noted the following: Amp1: Hi-Freq lit up, Power button does not work (but amp defaults to on) Amp2: Hi-Temp lit up, Impedence button does not work Amp1 & 2: smoke coming from...

I'm still not home, but I pulled the covers off while these were sitting in the trunk of my car to take some better photos of the boards. I found that one amp has been repaired and/or modified in the past. See photos:

Motorola TP9054 and RCA 66546. I was also told that both of these amps were built/modified by an engineer named Leroy Weber in the early 80's. I have no idea what was changed, but they were supposedly configured for increased output over stock. According to...

I dabble in this stuff, but have an expert on hand to make sure I don't do anything stupid.

I emailed WOA this morning asking about it, but haven't heard back yet. If anybody has any information about this, please let me know. We ended up staying another day so I haven't been able to test the amps or pull any parts for better photos yet. From what I've read about WOA, they...

I live in Austin, Texas. Visiting my parents in the NE TX today.

Going to be heading home with these guys tomorrow.

My wife and I are talking about driving up and spending a few days there this week. We head up there at least 3-4 times a year and stay a few nights each time.

Thanks! My dad was generous enough to give me two of them, along with two PL-4000 II preamps (one non-working) and a Sansui XR-Q7 TT. I just have to make a ten hour round trip to pick them up.

I've read they're quite rare. If they do have the PL-36 driver boards in them, it seems like the White Oak RevD will work according to http://forums.phxaudiotape.com/showthread.php/3689-PL14_20-Revision-D-Control-Board-Assembly-now-available So was the issue on the 400/700's that they didn't...

I will as soon as I get them! They're at my dad's house still - about five hours away. I might make the trek this week to get them. He's the original owner from when he bought them in 1982, I believe.