From eslawson@juno.com Fri Sep 07 19:10:00 2001
Subject:Re: Accessing the 12AX7 in Motion Sound KBRm


Thanks to John Fisher for the step-by-step instructions. I just
performed this tonight and relaced the stock 12AX7 wih a NOS Mullard
12AX7. For anyone using Motion Sound gear, I recommend this experiment.
I won't know the full effect until I get the amp on the gig, but from
what I am hearing, the different tube is making a nice change in tone.
The overdrive is crisper and covers more of the freq spectrum.
Previously, I was getting a lot of low and mid drive but less highs.
Changing the tube seems to have helped quite a bit.

I'd be curious to hear others' experiences.

Regards,
Eric

> John Fisher wrote:

> 1. remove the 12" speaker and wires. (note polarity)
> 2. remove the top plastic axle support.
> 3. remove the Phillips screws inside the speaker chamber going up
> into the
> chassis.
> 4. remove the Phillips screws on the rear of the chassis.
> 5. slide the chassis and speakers wiring out the back.
>
> Please see our web side tech/legacy for tube information.
> Not all
> 12AX7 are the same and you may degrade the M's performance. The
> Sovtek
> 12AX7WA should last at least 6 years.
>
> John Fisher
>