On 8/23/2012 1224, Damien Mannix wrote:
Hi all,
Bought an immaculate looking TR4 which has been out of use a long
time. Also bought an AC4 which claims to have had the original EHT
caps and diodes replaced.
Powered them up with 20 vac for four hours, then up in 20 v steps at
four hours per step, listening and sniffing for any problems. Reached
220 vac an hour ago. AC4 slightly warm and centre of TR4 top a bit
warmer. Then there was one hell of a crack! Sounded like a gunshot
and frightened me to death! Swiched off immediately of course. No
smell that I can detect.
Is that what an exploding capacitor sounds like? Any advice on where
to start looking? The TR4 or the AC4?
Sad day for me. Trying to return to the hobby after over 30 years.
Been too busy making a living and bringing up a family.
Regards,
Damien
G3XER
I had this happen to an R-4B probably 25 years ago. A medium sized lytic
went off like a bomb. Many tiny fragments to extract from under the
chassis but upon replacing the cap, all was fine. Very startling.
--
*Charles Ring W3NU*
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