I've ordered some PCBs from Andy and am awaiting the parts from Farnell (which cost about £20 less than RS), but when I finally come to hook up the superregs, I'm curious as to the best way to do it.
Current setup: 62/140. The 140 is powered from the mains by standard Naim mains cord. The 62 is powered from the 140 by standard Naim 4-pin Snaic. The 62 has the buffer stage bypassed, to there's only the gain stages to power. The power rail decoupling is done by 56u/25v oscons bypassed with 680pf Wima green caps.
I've measured the DC across the pins of my 62's 4-pin connector and I've got 24.4v coming into it from the 140(not much headroom for my oscons!)
There are a few ways to tackle this and I'd appreciate feedback:
1. Mount SR in the 62 and configure it to output 19.4v from the 24.4v provided by the 140. This is the easiest solution, but will running the gain stage at 19.4v be sufficient? Neil McBride's website suggests it will be, but anyone else like to offer insight?
2. Modify the output of the 140 to provide 30v, then do the same as above except configure the SR to output 24.4 as it's doing just now. Easy? Hard? Sensible? Possible?
3. Mount the SR in the 140, replacing whatever regulation is already present. This presents a few challenges (I'm not even sure what they are, considering I don't know the layout of the 140 yet - this is all theory). Is it possible or even sensible?
4. Any other ideas? ("buy a hicap/snaps" is not a useful suggestion )
Cheers,
Carl
Current setup: 62/140. The 140 is powered from the mains by standard Naim mains cord. The 62 is powered from the 140 by standard Naim 4-pin Snaic. The 62 has the buffer stage bypassed, to there's only the gain stages to power. The power rail decoupling is done by 56u/25v oscons bypassed with 680pf Wima green caps.
I've measured the DC across the pins of my 62's 4-pin connector and I've got 24.4v coming into it from the 140(not much headroom for my oscons!)
There are a few ways to tackle this and I'd appreciate feedback:
1. Mount SR in the 62 and configure it to output 19.4v from the 24.4v provided by the 140. This is the easiest solution, but will running the gain stage at 19.4v be sufficient? Neil McBride's website suggests it will be, but anyone else like to offer insight?
2. Modify the output of the 140 to provide 30v, then do the same as above except configure the SR to output 24.4 as it's doing just now. Easy? Hard? Sensible? Possible?
3. Mount the SR in the 140, replacing whatever regulation is already present. This presents a few challenges (I'm not even sure what they are, considering I don't know the layout of the 140 yet - this is all theory). Is it possible or even sensible?
4. Any other ideas? ("buy a hicap/snaps" is not a useful suggestion )
Cheers,
Carl