In a message to Duncan Markley  Rich Lockyer wrote:
RL>  Phantom power was applied to the input.  I'm not familiar with PA
RL>  systems enough to know if phantom power is +12, +24, or AC... or what
RL>  it would do plugged in to a tube device input.
Phantom power is DC, and can be anything from 12V to 48V.  It is applied as 
pins 2+3 of an XLR being positive and the shield being negative.  I may have 
the polarity reversed though - it's been a LONG LONG time since I worried 
about the nuts and bolts of Low-Z mic level design.
It would be odd to actually have phantom get through an adapter, since most 
people tie pins 1 and 2 of an XLR together inside the adapter cable, which 
shorts the phantom to ground.  
 
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