kiat Posted December 1, 2016 Share Posted December 1, 2016 Hi, I've an old tube Traynor Bloc 80B bass combo, that, after I turn every knob down to zero, then turn the power off (there is a switch at the back or at the mains) - there is a very loud short sharp sound through the speaker like a crack or snap that makes my band mates jump. The volume is like I was playing it at half-volume. It's done it for years, but I'm using it more at rehearsals and I just want to get it sorted. Any ideas? Quote Link to comment Share on other sites More sharing options...
Twincam Posted December 1, 2016 Share Posted December 1, 2016 Tube? Nope its all transistor. Its probable best to get it serviced. It could be it has some capacitors that stops that thump or at least dampen it that need changing. Quote Link to comment Share on other sites More sharing options...
kiat Posted December 4, 2016 Author Share Posted December 4, 2016 [quote name='Twincam' timestamp='1480625799' post='3186008'] Tube? Nope its all transistor. Its probable best to get it serviced. It could be it has some capacitors that stops that thump or at least dampen it that need changing. [/quote] Thanks Twincam. As it was so old I thought out was tube, as I'd not peeked inside and I couldn't find the spec online for it. Before I take it to a specialist, if it was something fixable by a layman, then I'd give it a go. Quote Link to comment Share on other sites More sharing options...
Chienmortbb Posted December 4, 2016 Share Posted December 4, 2016 The problem is that your amp is putting DC through to your speaker as the power supply collapses. It may or may not be a fault and probably won't hurt your speaker but it is not nice. Quote Link to comment Share on other sites More sharing options...
kiat Posted December 14, 2016 Author Share Posted December 14, 2016 [quote name='Chienmortbb' timestamp='1480892933' post='3187955'] The problem is that your amp is putting DC through to your speaker as the power supply collapses. It may or may not be a fault and probably won't hurt your speaker but it is not nice. [/quote] Thanks for the explanation. Is this a common thing with combos? Quote Link to comment Share on other sites More sharing options...
MoonBassAlpha Posted December 19, 2016 Share Posted December 19, 2016 Lots of combos do this to a greater or lesser degree. I suppose you could fit a relay to disconnect the speaker as the power is switched off if it is all that bothersome, or even get a double or triple pole mains switch and route the speaker wire through the normally unused poles. Quote Link to comment Share on other sites More sharing options...
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