Trev Ridney wrote:
> 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
>
>
Another excellent educative an informative response! If I *do* end up
owning this amp, I know where Ill be bringing it to be looked after!
cheers
Gary
http://thumbrella.blogspot.com
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Posted: 2006-05-06 22:37:08
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