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, DamienG3XER
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