[DMcMahon]

Good call Ted.

Pressing the Monitor switch a couple of times got Playback working normally, recorded quality sounds good.

The Monitor switch is a 2 position non latching push switch with the Normal position (not pushed down) being for off tape monitoring (designated B) and the pushed down (and held) position being for straight real time monitoring comparison of the original and recorded signals (designated A), in the pushed down position there are no signals to the DIN outputs.

For good measure have sprayed the Monitor switch with contact cleaner and well exercised. Both positions of the switch now appear to operate normally but yet to fully test the A position as do not yet have suitable high impedance headphones connected to 2 pin DIN connectors.

Things still to do:-

1. PB head azimuth adjustment, because the control knob broke off can not set it to its default setting, from a few quick adjustments not hearing a huge difference, may need to find some music with more HF content or record some HF signals from signal generator and check playback signal on scope.
2. The mains on/off control (part of the tape speed switch) is stiff, need to investigate.
3. Replace decomposing brown foam on PCB clamp down bar.

David