[martin.m]

Thanks for all your replies. I've never liked DIN sockets but the one on the front of the amp is handy for occasional use with a tape recorder. Studying the circuit diagram for the TK14, the machine doesn't seem to have a Line input, or a Line output either. Pin 1 of the "Radio/diode" socket goes to earth via a couple of 22k resistors, while pin 3 connects to the ECL86 triode's anode via a 220k resistor and 0.1uF capacitor. I can't imagine what this socket would be used for. The socket marked on the circuit diagram as "output" is for a speaker. It seems that with the TK14 the only way to make a "direct" recording would be to use the microphone input with a suitable attenuator circuit. The arrangement of DIN sockets on the TK18 is very similar to that of the TK14. Mono operation wouldn't be a problem as the amp has switching to select either Left/Right input or mono.