Hi all.
Hoping someone can help me out with a problem with one of my API 312 (Bob's Hybrid boards). Sound great too by the way using Ed Anderson's trannies.
I have built 8 of these but one is giving me greif.
The problem being that 48V dosn't seem to be getting through to the (Input XLR) for phantom power.
I have 48V at one end of R26 and the other end is 42V, I then have 42V at next point being R27 but 0V on the other side. 0v on input XLR pins also.
So I have gone a while without 48V and thought it would be ok but then the channel wouldn't work altogether (no 15v). I replaced a few parts and seem to have the 15v back but still no go with the 48V.
I have replaced D1,2 and R26,27,28 .
Any advice??