MAC for MATCH-AC (1590B Okay!)
This is a MATCHLESS / AC30 Emulation.
If you are familiar with OLC MATCHLESS, this is the stripe down version of it.
Tone selection section is striped.
The trace at bottom left of PCB is quite tight. Becareful to avoid solder bridge.
Q1 is MOSFET, BS170 or 2N7000.
Q2 and Q3 are JFET, J201.