I was given a road weary RD 112 Fifty. I've been cleaning it up and it sounds and functions well. The serial number is EN12575. I am trying to learn more about it, but instead of having a Limiter on the distortion channel it has a Mid Shift switch. I have not been able to locate definitive data or the manual for an RD fifty with the mid-shift switch as opposed to the limiter.
I little to no knowledge of electric guitar amps for I am primarily an acoustic guitar player. However, I am willing to learn! :)
I am guessing this is a 1983 model, mainly by the info gathered so far and the sticker on the back.
Any help or knowledge shared about this amp will be greatly appreciated.