MXR Phase 100
jocke at netcontrol.fi
Mon Mar 9 17:10:48 CET 1998
R.G. Keen wrote:
> I think it was always six stage, only four of which moved; two
> were fixed, no variable resistance.
Now this is interesting! I automatically assumed the unit I opened
was a 6-stage device, since there were only three opto-couplers.
> Silonex parts. They're on the web, probably with descriptions of that
Right. They're at http://www.silonex.com/.
> Just opened my Phase 100. I see 3 opto-isolators labeled 21L 312.
> There are 6 8-pin ICs (TI) SN72L022. Is this 6 staged or only 3?
Six variable stages, since the optos are dual devices. Interesting
part numbers -- I'll have to do some investigation.
> There's a sticker inside with what might be a seial number? 705092.
> How can one tell if it is a "Dunlop re-issue"?
The Dunlop re-issue has a LED "on/off" indicator above the "MXR" logo,
and a 9V DC input beside the signal input jack socket.
Also, the intensity selector positions are reversed, i.e. the highest
settings are to the left.
The op-amps are TL062s, and the output is reasonably noise-less
(especially for a stomp box). A picture of the unit can be found at:
Thanks, people, you've been very helpful!
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