Actually I might be getting +47.5v on each pin , I might have just had the Polarity of the DMM backwords...
The PSU runs off of a +/-15v Supply so it uses a voltage doubler/rippler a couple times over to get up to between 60-70v and then the LM317 regulates it to 48v...
One thing I notice about the LM317 is it is extremely sencitive to any shorts or reverce voltage being applied and even the Slightest bit can cause it to blow....
I was thinking of putting in a Diode to protect against reverse voltages but I don"t know if the Diode will pass the audio signal that is going the other direction....
The one channel that works though sounds "Super Sweet" ,Unlike any pre I have really ever heard before , but then again I don"t have many pre"s to compare it to, but I know what I like and It definately sounds awesome....
I"m going try re-grounding the noisey channel and see if it helps with the noise...If that doesn"t help i might try putting in a Freebe Toroidal Transformer I got today and see if that helps but I don"t see how one channel would get interferance and not the other, It might also be that I haven"t set the CMRR but I don"t have a Scope so I can"t do it.....
Cheers