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Today I’m listening to Dickie Betts on the Barn Find PL400 off the DBT. I’m doing a short victory lap. Mark, I got the PL14B and it is indeed sweet. It does indeed look to be a virgin. I went through it part by part checking all the resistors, caps, diodes and transistors and found not a...

It is sagging under the DBT. And B+ sags more than B-. About 10+ and 24- IIRC.

Mark, you NEED an OPPO player. Know that OPPO has a wonderful warranty program. About $150 IIRC flat rate repair including return shipping. My BDP-95 was returned very quickly. If you were to buy one off of fleabay that was sold for parts or repair you could have it shipped directly to OPPO for...

Okay, I lifted both sets and the problem persists. If I understand correctly, this suggest the problem is not with the Gremanium transistors or the network to the right of them on the drawing. The bias circuit works as expected and Q6 tested well a week ago. I’m thinking I should focus on Q7...

What a deal. Matched pairs for a buck ninth nine is pretty had to beat.

That sound like a good plan. Thanks.

Thanks for the compliment. I just bought a hakko 472D rework station and I could not do this kind of work without it. I see your Q3 and Q4 are installed as mine. Phase Linear must have had board revisions for which we do not have documentation. I’ll send you a PM about the board. I’m likely...

The photo here is upside down from the drawing with Q4 over Q3. On Q4 we see the left pin trace to to Q5 in the center of the board, so that pin is the collector, right. Collectors on the bottom of a PNP. Q4 is an A93 and EBC. That divide is installed with pin 3 on the left and pin 1 on the...

Oh, I see. I missed your point at first. I’ll look into Q3 and Q4 placement and get back to you.

You can see the trace that encircles Q1 and Q2. In the photo it’s Q2 on top and Q2 on bottom.

I know exactly what you are talking about. It’s a real head scratcher. The board is printed with the devices pictured opposite their placement. Also the hole pitch is triangular as are the device leads. As I have them installed I had to bend the center lead forward to correct for the mistake...

New original production 7591A have been hard to find for at least ten years. The story is that someone from Asia bought up all the retail inventory over a very short period. That would have been about 2000. Reminds me of the Hunt brothers and silver.

no doubt

Check your center to center dimension. Mine is 4cm, about 1-5/8”.

I thought you might appreciate the pioneer irony.

We’re all thinking that the KSC1845 were to blame so I put the TIS97s back in. It still latches up. Snake bit, haha.

Yes, they are done correctly. Doesn’t hurt to double check. Edit: I’ve been listening to it for hours now on some Baby Advents. is spooky how quiet it is with the 9600uf filter caps. Measures about 2mv ripple at most. I’m using 1 amp fuses for speaker protection so I’m keeping it down below...

Yes I did Swizzle them. Properly? That’s worth a second look. I get back to you.

Gepetto In the latched condition they are slightly negative. Left Q1 is -.501 and Q2 is -.571 Right Q1 -.496 and Q2 -.560 Operating unlatched the collectors are both at about 20v. I don’t see Q1 much lower than Q2. About 50mv difference. Edit: I’d expect the parallel reversed diodes on...

I didn’t disconnect the Zoebel but I measured voltages across the resistors while latched up and got no voltage on the mv scale with good flukes. The C6 voltages while locked up are both .575 so the diodes are good. I’ve attempted to isolate the problem to a single channel by starting it...