[sdiy] more sh-101 mods?

[Paul Higgins]

> "The 'voltage controlled potentiometer' is one of the Holy Grails of 
> s-diy design. There
> are so many ways to do it, and none of them is quite perfect."

Mesa/Boogie used pairs of LDRs, driven with opposing control voltages, 
to act as voltage-controlled pots in their TriAxis tube guitar preamp.  
By all accounts it seems to work pretty well.  I think our own JH did 
something similar with his Poly-Korg clone.  Mesa used LDRs for a very 
practical reason: the high signal voltages in tube circuitry make most 
other solutions impossible.

> That reminds me of an idea to use a motorized pot. Electronic Goldmine 
> has them for cheap but I keep forgetting to include it in my orders. 
> Has anybody experimented in this area?

Another example from the tube world: Tim Caswell of Studio Electronics 
used servo-driven pots (six of them, I think) in the Soldano/Caswell 
MIDI-controlled guitar preamp.  A no-compromise--but pricey--solution 
to the problem.

-PRH