LITTLEWING Posted July 15, 2016 Share Posted July 15, 2016 I've just acquired an Ampeg BA115 combo and when turning it off (both volumes down) it pops through the speaker a second after switching off. I used one a while back in a local studio and it did the same which I assumed was something that needed attention after time with all the different player's usage. This one does exactly the same and I wondered if it's anything to worry about or is there a mod that an amp tech could or should do? I assume it's not ruining the speaker in any way? Quote Link to comment Share on other sites More sharing options...
CamdenRob Posted July 15, 2016 Share Posted July 15, 2016 Other more knowledgeable folks to follow but my Glocknklang did this and i think it was just a capacitor discharging or something... made a god awful noise if you turned the amp back on again before the pop had occurred... Quote Link to comment Share on other sites More sharing options...
MoonBassAlpha Posted July 16, 2016 Share Posted July 16, 2016 Nothing to worry about. Loads of older design amps do this. I think it's just the power supply capacitors discharging a bit asymmetrically. Many modern designs have a relay that disconnects the speaker before the power supply is removed, hence no thump. Quote Link to comment Share on other sites More sharing options...
Number6 Posted July 21, 2016 Share Posted July 21, 2016 Capacitor discharging i believe.....i had a very old Carlsbro that used to do this up to about 5 mins after i switched it off. Quote Link to comment Share on other sites More sharing options...
James Nada Posted July 22, 2016 Share Posted July 22, 2016 My very first combo did this. It still does it 26 years later but otherwise works just fine. Quote Link to comment Share on other sites More sharing options...
rmorris Posted July 25, 2016 Share Posted July 25, 2016 [quote name='MoonBassAlpha' timestamp='1468675315' post='3092569'] Nothing to worry about. Loads of older design amps do this. I think it's just the power supply capacitors discharging a bit asymmetrically. Many modern designs have a relay that disconnects the speaker before the power supply is removed, hence no thump. [/quote] +1 yep - cap discharge thing. Can be a bit disconcerting if it gets to FOH 😣 If an issue new and poss tighter tolerance PSU caps may help to some degree. As stated many designs avoid it by anti thump circuits at turn on and turn off. Quote Link to comment Share on other sites More sharing options...
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