Read a bit about power supplies for SS amps on Rod Elliot's site and a 3-part article on the same (TNT - Audio) during a break from the plasterboard job.
Found from both sites and a few threads on DIYAudio, that I was sort of right about the 10,000uF of capacitance per rail in the original version of the NVA based amp, except that the 10,000uF figure was actually the value for a
mono amplifier. OK, so I was completely wrong in that case.I only had half the story! There that's better. Confession is good for the soul.
As it happened, I had a bag of 10 CDE (Cornell Dubilier) 6800uF-63V doing nothing, and three of them in parallel, give 20,400uF which is near enough. So last evening, the caps got installed, complete with new bus bars:
- Inside.jpeg (145.76 KiB) Viewed 4407 times
- SSPSU2.png (66.89 KiB) Viewed 4407 times
The result is not the major leap up in sound quality that happened in the previous post, but there was a slight improvement in the solidity of the soundstage. Everything is locked in place, solidly grounded and everything stays separate and easily followed, no matter how loud or complex the going gets.
That there is more that could be done in terms of HF filtering and inductance killing networks is a given, having read up a bit, but I'm enjoying the solid qualities so far. As RD would have put it, "A bit more muck cleaned off the window."
Sgt. Baker started talkin’ with a Bullhorn in his hand.