Marshall AVT50X Combo Amp Has Issues

The customer was headed to the recording studio with his favorite amp.  However, our patient has two issues. When the unit operates, the fan is noisy and the output signal comes and goes when you tap around the headphone jack. When you don’t hear the fan anymore, the whole thing has quit. Can the Unbrokenstring…

Ampeg BA115 Bass Combo Amp Repair

Mysteriously, this modern Ampeg bass combo amp quit working.  Could the Unbrokenstring Crew make it right? The unit appears to be completely dead, with power present at the fuse holder.  Let’s go inside to take a look around.   More goodness from St. Louis Music.   This picture documents the wiring polarity on the main…