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I just went through this exercise on my Fender Pro
Junior, which is known for it's noise and over brighness with stock tubes. I
bought some of the new Mesa Boogie SPAX7 tubes, and the results were
outstanding. It sounds like a new amp. Quit, warmer, etc.
The
SPAX7
The Mesa SPAX7 is a
12AX7 that during our in-house testing processes is found to have a
significantly quieter and more stable response to high volume and gain
applications. If a fledgeling 12AX7 passes its first test, it is tested a
second time under more stringent listening conditions and even
higher volume and gain levels. If the young SP passes this second test, it is
outfitted with a sleek layer of shrink wrap that helps shield the tube even
further from field and transformer noise. We recommend using the SPAX7 in input
preamp stages (usually located nearest the input jacks), as the input stage is
generally the most volatile. An SPAX7 input tube will lay the foundation for a
quiet and stable amplifier in the highest of gain and volume applications, and
is a sure winner when playing microphonic musical chairs in search of that
troublesome squealing or crackling preamp tube.
Tien Lawrence
Boogie Customer Support
Kris
----- Original Message -----
hi,
i have been playing the marshall jmp-1 preamp on some new recordings. I
have noticed a considerable amount of hiss even though I use the clean channel
with speaker simulation. did anyone else experince this problem? i would like
to change the tubes. which brands would you recommend for that?
sorry this a little off topic.
thanks and best regards.
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