Ok, I finally got things back into gear on the 7000. Here is some of what has transpired recently.
The big caps are a power reservoir / filter cap, the two output-coupling caps, and a smaller power supply cap. All of these are "so big" they need collars and this huge section dedicated to them.
C811,C812 2200 uF 80V
C005 3300 uF 100V
C004 1000 uF 50V
C811 and
C812 are the audio signal path caps that couple the power amp board's output transistors to the speakers. It is critical to keep the same capacitance value as this forms a filter on the output and any larger value would increase the bass emphasis. So, these get Nichicon KG 2200 uF 80V caps with snap-in leads.
C005 is the primary power reservoir and filter, so increasing its capacitance will smooth the rectified DC more and provide additional dynamic range. If you're in the camp that believes that. So, this one 4700 uF 100V Nichicon LS series. No fancy marketing hype, just more capacity.
C004 is a plain old power supply cap, so the Nichicon PW series is fine here.
The
big deal with these caps is the originals are huge by comparison and are expected to be held in place with vertical collars. The new caps are tiny, especially in diameter, so you need something to firmly wedge the caps in the collars.
I've used foam tape and even insulation as a wedge between the collar and the cap in other units and never really been satisfied with that.
So, since this is a restore for a good friend and I'm working on a unit for myself as well, this is a good time to up my game and experiment with a better solution.
What I did was locate some wood discs of the right diameter, affix the caps the to the discs, then use the collars to firmly hold the disc+cap assembly. A little drilling to allow the leads through and we're set.
I did extend the snap-in leads with station wire so they could reach the existing wiring.