One fluke eBay win, and I have a new friend! Say hello to the Schaller Solo, a 25W 'universal amplifier' from the cusp of the 70s, containing eleven transistors and with a built-in tremolo. Advertised as for 'guitar, organ and other instruments'. So cute and tiny, who could resist?

The tremolo channel sadly doesn't work at all, but I can't find a schematic that I could use to fix it. Might have to reverse engineer the PCB at this rate. Anyone on Fedi know where I might source a schematic for this thing?