On Fri, 3 Oct 2008 16:47:49 +0100, "David Looser"
wrote:

"Marky P" wrote in message
.. .
On Wed, 1 Oct 2008 10:42:53 +0100, "David Looser"
wrote:


Since the OP has remained silent since his first post what he actually
wanted remains a mystery.

David.

Very sorry! I forgot made this post (someone over at alt.digital.tv
remined me). I want to test for faulty caps. It's in a power supply
unit in a 1980's professional multi-track tape recorder


Faulty capacitors in power supplies usually make themselves apparent by such
problems as low voltage or excessive ripple on one or more of the output
lines, or rather more obviously by leaking electrolyte, bulging seals etc.
In view of the age of this unit your best bet is probably simply to replace
any suspect capacitors rather than bothering to try and test them.

David.

Basically, there was a severe buzzing noise on the output and the
fault was traced to the PSU supply not being stable. The caps were
replaced and the problem was rectified. Well, within a couple of
months the fault is back, and instead of paying silly prices to one of
the very few tape machine repair guys around, my mate wanted me to fix
it if I could find the faulty caps. The last repair cost £500. The
tape machine is a Saturn Soundcraft, and aparently there is only one
person in the country who can repair them (he lives in Bury St.
Edmunds).

Marky P.