It's working! I'd really like to claim that I'd undertaken some brilliant repair job, but in reality all I did was "waggle" every connector on the PSU board and then try it again (bringing it up on the Variac; the relay will kick in at ~140V). That's very pleasing
. I wonder how much longer these machines will last? I still have some cassettes I need to digitise.
Thanks to everyone who offered their advice.
B