Chimike Posted October 13, 2011 Share Posted October 13, 2011 HI, Seem to have a strange one here, so would apreciate any input. I have a TE 3 channel gpr preamp, and I know the channel switching relays are not functioning properly, should be easy fix, if I can find the same relays. However, every now and then , there is a sharp " crack " sound, and I noticed, at the same time, that a miniature blue spark would jump from the amp, but not always in the same place ! The designer of the amp advised me to check the soldering to the valve bass, as that's where the highest voltages are, but only 120v, didn't think that could jump 1/4 inch. Could the Toroidal be at fault ? or a condenser ? What could cause this, anyone have any ideas? Sparks, like miniature lightning, seem to jump into the air, from the amp chassis, but it is so quick, that I might be missing something. Mike. Quote Link to comment Share on other sites More sharing options...
Ou7shined Posted October 13, 2011 Share Posted October 13, 2011 Do not switch it on again and take it to a qualified tech. Quote Link to comment Share on other sites More sharing options...
Chimike Posted October 16, 2011 Author Share Posted October 16, 2011 Good advice, thank you . At the moment, I am interested in what could cause the problem, the highest voltage from the transformer is + or - 15 v, shouldn't be able to generate this kind of thing. I work with several electronic engineers, ( I do their mechanical work ), but before I get them involved, I'd be interested in understanding what's going on. Quote Link to comment Share on other sites More sharing options...
Ou7shined Posted October 16, 2011 Share Posted October 16, 2011 Maybe your transformer only puts out 15v (when it's working properly) but a discharged capacitor can give you a massive kick. Also don't forget you have 240v going in so it could be that the problem comes before/at the transformer. Quote Link to comment Share on other sites More sharing options...
rmorris Posted February 13, 2012 Share Posted February 13, 2012 Did you get to the bottom of this ? Quote Link to comment Share on other sites More sharing options...
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