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Thanks! I would not have been able to figure that one out.

OK, thanks for the clarification. Here's another question: Can anybody tell me what the circled components are in the photo below? I think I figured out the rest of what I'm seeing. Thanks!

I have a schematic for the PL400 series 1 & series 2, but neither of them look like the one you show here. In my series 1 schematic the bottom row transistors are labeled Q12, Q14, Q16 and Q18, (left to right). In my series 2 schematic they are labeled Q108, Q109, Q112 and Q113. So how many...

So how does it sound?

...i.e. if both are fully modded.

How much difference is there between a fully modded PL400 series 2 vs. PL400 ?

Understood--that was my first double-indented bullet point, ("control board in quasi mode and listen for awhile").

So best order if I don't want to buy anything that I later don't need is: DCP Cap upgrade Control board control board in quasi mode and listen for awhile OR control board in full mode, and commence the backplane upgrade upon completion (I assume there are plenty of tests to confirm the...

Or at least I've asked for an invoice...

Thanks for that info. I've ordered the board.

What is a "DCP"?

Well I was assuming the back plane project was already going full complementary. So can all the upgrades be done without going full complementary? I.e. is going full a separate project in itself, but more easily done as part of the upgrades? Related question--is the new control board usable in...

Can the backplane upgrade work without upgrading the control board--eventually I will do the whole thing, but I want to parse it into manageable projects so I can at least finish something sooner. So could it work as follows: Project 1: Backplane + output transistors (is it 6 of each?) Project...

Have you completed the upgrade successfully?

Do you know Eric?

Do you need to see more than this?

OK, my next question: is the PL400 version I have compatible with the stock upgrades available?

I know its subjective, but how would you describe the sonic improvement realized by the full upgrade.

It was being used in a live sound situation, so 1/4" more common than RCA. They also added a on/off switch on the front.

I guess I would start with most "bang for buck", or most "bang for easiest to implement" first, and then go from there. I would want to focus on sound before aesthetics, and I would consider the back plane as the last thing to tackle because I would want to first hear how it sounds in its...