Hello, I have an ASUSA K2003 amplifier from the early 2000's. I'm not the original owner, and never obtained the documents or schematic.
There were some posts here about 20 years ago regarding this little amp. I'm hoping someone hanging out here might have some information to share.
It sounds great, but the tube sockets are getting loose and intermittent, I'd like to replace them and give it a general health check, but I have nothing to go by. I'm an amateur enthusiast, but I can solder just fine.