View Single Post
Old 13th Nov 2007, 5:48 pm   #13
russell_w_b
Dekatron
 
russell_w_b's Avatar
 
Join Date: Jul 2007
Location: Penrith, Cumbria, UK.
Posts: 3,684
Default Re: Test equipment for valve radio repair

Quote:
Originally Posted by dominicbeesley View Post
I picked up a nice sig gen for a tenner at Harpenden and that's been useful, both in diagnosing and aligning but also in aiding my understanding of various things. Also its got nixie tube read out of the frequency which is cool!
I seem to remember that there used to be a pen-type probe device on the market that contained a square-wave audio generator rich in harmonics. it could be applied to any stage in an RF/AF circuit to obtain an output (of sorts) if the stage was operating correctly. I haven't seen such-like for years, but it wouldn't be difficult to make one.

A 100W incandescent lamp is a useful tool, connected - initially - in series with your device under test, and will limit current nicely if you haven't got a variac.

A 'Megger' (available on the surplus market) is also useful for testing transformers and insulation resistance, and will give an indication of leakage when applied to a capacitor of appropriately rated voltage.
__________________
Regds,

Russell W. B.
G4YLI.
russell_w_b is offline