News 2013-12-23 04:38:49
This is my first time posting to this group.
I apologize in advance if I missed any etiquette I should have followed.
My rhythm guitar player just got a Marshal JCM-900.
The distortion is for S@#&. He can get a really great clean tone, but when
he kicks on the drive it sounds like a high school band in a tractor
I was wondering what kind of impact a preamp unit might have on his sound.
We play a blend of newer rock/metal, and a lot of stuff from the early to
mid 90’s. He needs some serious crunch.
I hate to get rid of the amp because its clean channel is quite nice. If I
could find a way to enhance his distortion we’d be set.
Any advice? Any input?
Thanks in advance all.
James R Williams
David 2013-12-23 04:38:54
Those amps are known for great distortion. Have you checked the tubes in the
drive channel section? Is there a loss of output when you change channels?
Perhaps Lord Valve will chime in and point you towards more things to check.
Ken empson 2013-12-23 04:39:02
You might think I’m joking, but I’m not. Put a Marshall ShredMaster in front
of it. Really. The ShredMaster has a nice Parametric EQ, and you can get
some warmer OD tones that way. Another thing to do would be get rid of the
GT12-75’s, assuming it’s a combo. IMO, they are very harsh. V30’s would
sound pretty good thru that amp. Well, as good as that amp could get,
Scott colborn 2013-12-23 04:39:11
Many times a guitarist will try to set the amp tone controls up like
he’s heard they should be set, or from reading an article where so-and-so
says that they have their amp set up a certain way.
Have him set the amp controls by using his ears, not by the dial
settings. Keep a healthy mid-range in there – guys who try to dial out the
mids or turn `em down kill the sustain and the ability to cut through the
Have him use more volume and less pre-amp distortion. This will cut
through better. As strange as it may read to you, guys use a lot less
distortion than you think they do. The more pre-amp distortion, the more
the sound blurs and you lose the definition and ability to be distinctive
and stand out.
This assumes that the guitar, guitar instrument cable, and tubes in the
amp are healthy. What’s he using for a guitar (and what pickups) and what
is he using for a speaker cab?
All the best!
Walk in Beauty, Peace. Scott
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Mombu 2013-12-23 04:39:20
To my ears those amps sound harsh.
But who knows, maybe your friends amp isn’t healthy.
With out hearing it it’s hard to say. If you have the means to record and
post it we would be able to help further.
Also those amps aren’t know for having great cleans either.
in article xpP5b.265151$cF.83318@rwcrnsc53, News at NoFridays@insighbb.com
Jim anable 2013-12-23 04:39:39
The JCM 900 is higher gain with diodes in the preamp. If he doesn’t like the
tone, he should try a 2203 or 2204 all tube circuit (master volume JMP or JCM
800, earlier models are preferred by most).
Ronsonic 2013-12-23 04:39:48
My Chevy runs bad, should I change brands of gas?
Cgunter 2013-12-23 04:41:23
Turn to the clean channel. If this is the 100 watt version of this
amp I believe it has a switch for 50 or 100 watts. Turn it to 50.
Turn the preamp to 3 and the power amp to 9.5. How does it sound now?