Board swaps between QRX-9001 and 8001?

[LexDM3]

I have a QRX-9001 that I've been slowly working on. I replaced all of the fusible resistors in the F-2624 amp boards and adjusted the offset and bias. The four amp channels now work well. Next up is pulling the whole unit apart to rework the quad board feed-throughs and recap most of the boards. That project is likely to happen when I have some time over the holidays at the end of the year.

But wait. There's more QRX fun to be had! I just received a QRX-8001 from an AKer who decided to move it along. I'll take a closer look at it this weekend using Jim Showker's (QRXrestore.com) assessment suggestions. But I've been wondering something and thought I'd ask the Sansui wizards:

Can I swap similar boards between the 8001 and 9001 for diagnostic purposes? It looks like the 8001 also uses F-2624 amp boards but are they the same as the ones used in the 9001? The 9001/8001 Service Manual says the stock number for the 9001's F-2624 PCB is 7571471 while the same board on the 800a is stock number 7571481. I pulled them out of both units and they look the same. The PCB itself has the same P/N in the etch. I haven't checked to see if all of the components are the same.

Thanks for any information or advice. Below see an illustration from my new book, "A Tale of Two Sui's."

 

[LexDM3]

Looks like I answered my own question. Yes, the two updated F-2624 boards from the QRX-9001 worked just fine in the 8001 and solved the DC offset issue on all four channels. The offset went to between 20-30mV on all channels, the speaker relay switched on, and music played. More work to be done but I'm happy with progress so far.