[sdiy] optocouplers/Vactrols

[Harry Bissell Jr]

--- Paul Higgins <higg0008 at tc.umn.edu> wrote:


> Actually, Magic Parts 
> (guitar amp parts supplier) does just that; they
> sell a "Fender Vibrato 
> LDR" for $14 (wholesale price!) that from the
> picture looks 
> suspiciously like a 30-second job with some
> heatshrink and a butane 
> lighter.  I'm not kidding; I see no evidence of
> black paint or silicone 
> compound to fill in the gaps and make it really
> light-tight.

This would be VERY much like a 'vintage' Fender
Vibrato
unit... originally they used a photocell with a neon
lamp over it... and a piece of tubing surrounding it.

If you work on such an amp in LIGHT the vibrato will
not work correctly.  Turn off the lights !! :^P

OTOH in a Fender amp, the closed box is quite light
resistant !!!

H^) harry   (who repaired his first Fender amp at 12
years old... long long, too long... :^)