04-27-2017, 08:47 PM
to test the ext amp out you will need to plug your bass into the amp as you normally would, but then plug the ext amp jack into the input of another amp, or into a mixer. be sure you use the ext amp jack and not the ext spkr jack, as the latter could definitely damage an amp/mixer.
alternately you could plug your bass into a mixer or some kind of boost pedal, and then plug into output of the mixer or pedal into the ext amp jack, that would test your power amp. if you can get a loud signal out of the power amp this way, then your problem is in the preamp.
when you plug a bass directly into the ext amp jack you would expect it to be very quiet. but the fact that it was louder than when you plug into the input of the amp, leads me to believe that you could have a problem in the preamp. test the ext amp jack as I just described and we'll know for sure.
alternately you could plug your bass into a mixer or some kind of boost pedal, and then plug into output of the mixer or pedal into the ext amp jack, that would test your power amp. if you can get a loud signal out of the power amp this way, then your problem is in the preamp.
when you plug a bass directly into the ext amp jack you would expect it to be very quiet. but the fact that it was louder than when you plug into the input of the amp, leads me to believe that you could have a problem in the preamp. test the ext amp jack as I just described and we'll know for sure.