Vinnie,
Did you experiment with changing out the diodes for Hexfreds or other ultrafast soft-recovery types?
I replaced the 8 diodes near the top of the unit with MUR-860's. I'm guessing that these are the bridges for the power supply, but I didn't take the whole thing apart to trace out the circuit (no time to do that, really). I didn't see any other big diode bridges, though.
The original diodes in this position were 2A02, which are 100v 2A diodes. I don't think they're of the ultrafast or soft-recovery type.
I didn't see anything else that looked like a diode bridge aside from one at the very bottom of the unit. I wasn't able to access these by just taking off the cover and I didn't want to pull the whole thing apart, but these diodes looked much smaller. I would guess that this is the bridge for the CD player?
Anyhow, it's too early to say how the sound has changed, but I'll keep everyone posted.
I'm really interested in your impressions if you've tried it.
Best,
KT