[DonaldStott]

Thanks Lawrence - hope you understand my caution when confronted with connections not shown on the Service Instructions.

The solder connections to Pins 1 and 3 appear undisturbed do I am assuming they are original - I find it difficult though to reconcile these with the circuit diagram but perhaps I should just accept they are correct and move on?

Apologies for my typo that you corrected without comment, thanks - V5 is indeed a Mullard CY31 Half Wave Rectifier.

Now for C27 which should be a16 μF, 275 V but has been replaced by a 15 μF, 400 V - let's see what that's connected to?