gain of the 12ay7 occurs when I try to use the phantom
power with a Shure KSM 32. The blue power light goes
completely out and there is a good amount of gain for
about 5 seconds and then a slow fade to almost nothing.
When I patch in an outboard phantom p.s. everything
is fine. Am I right to assume that the lost gain is from
the mic's end? As opposed the pre itself?
Analoghacker wrote on another thread:
"yes the blue LED goes dim or out with certain condensor mics (the marshall, for example...). this does not effect the operation of the pre. it does show you how much sag the wallwart has when you add the draw of the phantom supply. this is the one area where the economy of the unit is apparent. i accept the responsibilty completely. if you can replace the 12VAC 1A wall wart with a 12VAC 2AMP supply, this will "fix" the lamp and the bass will be punchier too. "
I've done a quick google search and so far zero luck trying to track
down the 2amp supply. Any comments or suggestions?
thanks,
Murphy