Isn't the Synthacon res pot is like the boost control on the Dallas
Rangemaster treble boosters for guitar? From the GEOFEX site, regarding
this:
"Another quirk of the original is that there is a DC voltage across the
volume control, which also serves as the collector load resistor. This
means that it will inevitably scratch and crackle whenever the control
is moved even if you use high-collar conductive plastic pots. This was
OK in the time of the original unit, as the designer assumed that a
player would set up this thing and leave it, not twiddling the control
during a number. There are ways to "correct" this, but they complicate
the design unduly, so I have chosen to leave them out, going with the
original circuit. It will crackle when you twist the "boost set"
control."
Alas, the fix is not explained, although I bet one could find it
digging through the myriad Rangemaster clone schemos on the web...
Rangemaster treble boosters for guitar? From the GEOFEX site, regarding
this:
"Another quirk of the original is that there is a DC voltage across the
volume control, which also serves as the collector load resistor. This
means that it will inevitably scratch and crackle whenever the control
is moved even if you use high-collar conductive plastic pots. This was
OK in the time of the original unit, as the designer assumed that a
player would set up this thing and leave it, not twiddling the control
during a number. There are ways to "correct" this, but they complicate
the design unduly, so I have chosen to leave them out, going with the
original circuit. It will crackle when you twist the "boost set"
control."
Alas, the fix is not explained, although I bet one could find it
digging through the myriad Rangemaster clone schemos on the web...
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