Hey folks, great forum (I kinda ended up here by chance)!
I have a Marshall Mode Four head thats been sitting in the garage for a couple of years now - the output TDA7293 modules went up in smoke (at a bloody gig just before we were due to go on).
After a load of digging around on the internet, I've learned that this is apparently a common problem with the Mode Four, and that the IC's may go pop anytime even after they have been replaced. I've disconnected the power stage, and the preamp section and all the functionality works as it should (via the tuner out or FX send).
I've been looking at ways to improve the reliablity of the amp so that I can gig with it in confidence that it won't produce some onstage theatrics of its own! Is this something worth doing or should I simply replace the 4 IC's and hope it holds out?
I've attached copies of the power amp stage and power modules schematics, thanks in advance!
I have a Marshall Mode Four head thats been sitting in the garage for a couple of years now - the output TDA7293 modules went up in smoke (at a bloody gig just before we were due to go on).
After a load of digging around on the internet, I've learned that this is apparently a common problem with the Mode Four, and that the IC's may go pop anytime even after they have been replaced. I've disconnected the power stage, and the preamp section and all the functionality works as it should (via the tuner out or FX send).
I've been looking at ways to improve the reliablity of the amp so that I can gig with it in confidence that it won't produce some onstage theatrics of its own! Is this something worth doing or should I simply replace the 4 IC's and hope it holds out?
I've attached copies of the power amp stage and power modules schematics, thanks in advance!