[stonehopper]

Thanks Chris, I'd agree the diode checks seem more reliable than plugging it into an iffy socket and having one number displayed.

Question: - never having bought resistors before, am I looking for 2watt 5% carbon film 47 ohm and 2.2k ohm resistors such as those in Cricklewoods listing as 2W47R & 2W2K2?

There may be other issues to tackle yet - transformer possibly - but this is a start.

Cheers - Derek