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It’s hard to tell from your picture, but you really should use aluminum p-straps on the bias transistors for the best heat transfer.

Love it. Very LOW on the WAF.

First observation, the lock washers go under the nuts not between the screw head and PCB. Would help to thoroughly clean the board before I could provide further feedback.

Post a pic of the bottom side, lets see your work...

It's unfortunate this video left out the most important aspect of a cable review... LISTENING and quantifying the human perception of sound!! Did the cable have an audible impact on the sound of his system, using his specific equipment, in his specific room... Also, if you look at the AQ cable...

Like this? https://www.ebay.com/itm/134480371940?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=ecEOvcsCQPK&sssrc=4429486&ssuid=VbGzxrohS-6&var=&widget_ver=artemis&media=COPY

https://www.electronicsurplus.com/uid-isolated-sockets-for-to-66-transistor-and-other-components?srsltid=AfmBOorOiemQvINn4Yc8QD-xLCYqRP4nNgLiZAaSSXSX0WLMnPXPI2Bu

Highly recommend you solder the 3 position Phoenix connector on the back side BEFORE placing the lytic caps.

Unfortunate you did not realize sooner, I could have included some in my shipment of other parts.

If you haven’t already noticed, you will need to drill two holes in the original housing for mounting the new control board. The original board used 4 mounts on the perimeter, the new board uses 2 in the center. The 2 original lower mount holes can be used for mounting the bias transistors with...

Or for an overkill scenario, do both copper plate and wire RCA ground termination.

Correct. Post lots of pictures so we can follow along and provide feedback along the way

Remove the diodes and reuse the copper plate.

Convert to two RCA input and bypass the switch altogether. Run the inputs directly to the control board with high quality RG316 coax.

Full comp backplane boards, full set of MJ ‘95 & ‘96’s, and a new chassis is the answer to your question…

Although it’s a full rebuild of an original 700, the link below shows my build update that may have a few insights that should apply to your project. https://forums.phxaudiotape.com/threads/700-series-1-build.11076/

Bonamassa - High Water Everywhere (seemed appropriate).

That’ll buff right out… I’m refurbishing a similar commercial unit with chassis brackets right now (although it has meters).

Agree, complete the backplane board and control board assembly, then progress to chassis assembly. Transformer gets installed after securing the backplane boards and heat sinks. Most of my build threads follow this sequence for a new chassis build. I’ve only built one amp with the original...

I’m not in Chicago, but a little north near Milwaukee. I have many posts covering restoration builds of both PL 400 and 700 builds. Let me know if you would like to discuss further. -Eric