Carlsbro Cobra 90 Keyboard amp

Hi psophos, I used to have a Carlsbro Rebel, similar era. They used logic control with an 'ON' LED, hence 3 connections.

The pedal model number was FSE-2, the HH Electronic RF-2 is the same.

It would have been apart for inspection at some point of course, unfortunately I can't remember what was inside. Looking at the schematic, the footswitch controls TR1, which is the switch to turn TR2 on, TR2 is the reverb path.