Gary Grainger wrote in message
news:445cf848$1 2@mk-nntp-2.news.uk.tiscali.com...
> (It must be an hour since my last post!)
>
I remember that there is a balancing act to be had
> between the master vol. and the preamp vol. Any suggestions on how to set
> this for a good blues rhythm/lead/slide sound (I use a korean strat clone
> with Mighty Mite pickups.)
> cheers
> Gary
The JMP Master volume range first appeared in 1976 and was designed to
address the demand for the famed overdriven valve crunch at sensible
volumes.
The predecessors to these amps were driven into distortion by overloading
the output stage, merely by turning up the volume control. This also had the
effect of making the amplifier painfully loud.
With a MV design, the preamp section of the amplifier can be driven into
harmonic distortion, whilst the overall volume is governed by the master
control.
This works well, up to a point, but the sound produced is not as
harmonically rich as that produced by driving the output valves hard. Mind
you, I choose a less than perfect sound in preference to permanent hearing
loss every time . Power amp distortion, imo, is overrated anyway.
So, to arrive at a sound that is aesthetically pleasing, combined with the
natural compression of the signal that happens when the output stage is
cooking, its largely a case of dialing in the crunch and turning up the
volume to taste and watch for blood issuing from the ears (just kidding)
With a JMP50, Id personally go for a setting of around 7 on the preamp and
no more than 3 on the master. That way, you can back off on your Strat to
clean up the tone, crank the guitar to 10 for your solos. But thats just
me.
Do it that way and your singer and the venue owner will love you, not to
mention the sound engineer sat out front.
These days, I use a THD Hotplate and turn up the wick on both preamp and
master and attenuate the signal twixt amp and speakers.
Dont know were born, nowadays ;)
Trev Ridney
Tipton Amplification
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Posted: 2006-05-06 19:59:33
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