> I wonder if the A-138e can be easily adapted for use with the A-101-9
> Vactrol module
The A-101-9 can be used only to replace a simple resistor. The A-138e uses
custom made potentiometers with additional center tap. It's not possible (at
least not in an easy way) to use the A-101-9 to make a voltage controlled
version of the A-138e.