Help on Marshall AVT150H gone bad..please

[bryanarzaga]

Ok we were trying out the AMP without no cabinet, we plugged a headphone on the headphone jack and its sounded amazing but we didnt have a cabinet so we tried plugging in to a crate combo amp, so we did AVT150's speaker out -> input of the crate combo amp 65watts, it sounded great so after 30mins or so i decided to power it off, but when i hit the combo amps power off switch the light of the the marshall AVT150 went flickering an i think i heard a pop sound after which the amphead gave off a burnt smell, so we opened it up and saw the fuse was burned out, my question is, is because of what we did is there any chance that we fried the amphead? or we just need to change the fuse? also where will we get a replacement tube?

Please advise..thanks

[deluxe reverb92]

oi. you're never supposed to plug the "SPEAKER OUT" on an amp into anything but a speaker cabinet.

[bryanarzaga]

oi. you're never supposed to plug the "SPEAKER OUT" on an amp into anything but a speaker cabinet.

yeah lessons learned but is there a way to fix it?

[quazcha]

The power amp IC's you are looking for are TDA7293's order at least 4 pcs from mouser or digitech- you will need 2 pcs- thats what the smoke smell was, and may go through another set (or two) if there are other problems, first disconnect all plugs to the 2 IC power amp pcbs, replace the fuse and listen to the headphone out-hopefully you will have sound. the power amp IC's need to be replaced as a set. do a search for AVT150 and MG100HDFX the both use the same IC. email me at: quacha at yahoo dot com if you need the schematic.