[Harp-L] Re: Harp-L Digest, Vol 17, Issue 14

[rob.clark@xxxxxxxxxxx]

Quote:
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Subject: [Harp-L] Power Tubes shot???
I was between bands about 2 months and not using my
amp.  I started with a new group and switched out to
some lower gain preamp tubes, in hopes I could get
louder and change my tone.  Since, feedback hasn't
been a problem, but now I get way less volume.  I can
crank everything and get no feedback, but very little
volume difference from 1 to ten.
I find it hard to believe the preamp tubes are the
reason for the problem.  I just don't see them
creating that much volume loss (I've done this before
without an issue and the tubes are only 5751's).  I
tried running my amp into 4x10's, but there was no
difference in volume.  I've had the amp for about 9
months and have never touched the power tubes.  Could
this be the source of my problem?  I am afraid to
spend a large chunk of change to find out it has
nothing to do with it.
The guitar player has the same amp and plays it at 2,
whereas I was at ten last night and couldn't hear
myself.

Mike

Reply:
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Mike, 
Double check you mic cable wiring.  Are you using an impedence matching transformer if you are using a regular vocal mic and an XLR to Phone Jack cable?
Greeeeeeeen Bulllllllets and CAD microphones have the transformer built in, as do SM545s.  However, standard vocal mics do not.  If using an SM545, do you have the internal pins set correctly?

Rob