Circuit for a simple mains-powered capacitor leakage tester.

[Yorkie]

I thought this simple circuit from January 1961 Practical Wireless might be of interest. It shows a metal rectifier but these days a 1N4007 or similar silicon diode would be fine in that role.

Neon panel lights are plentiful and cheap. EG:

http://www.ebay.co.uk/itm/2-Neon-Panel-Lamps-Lights-Red-Green-Amber-Mains-240V-/360229004289?pt=LH_DefaultDomain_3&var=630000900010&hash=item53df526401

Hope that's of interest to someone.