Hello everyone,

I'm sorry if this is a bit of a newby question, but my knowledge of how things work is pretty rudimentary!

Anyway, I have a Marshal MG100 hbk solid state amp that suddenly developed a problem. I've noticed that the volume is cutting out, when working properly everything is well, but I will be playing and after a couple minutes I will have a drastic reduction in power (not sure if there's a tone difference). This jumps back and forth as I play and is obviously quite frustrating. I'd say the volume equivalent on the knob is: when working 9 o'clock, when not working 3 o'clock.

Any thoughts on what is wrong (and whether it is easily fixable) would be much appreciated!

Thanks!

Hello everyone, I am new here and I am trying to fix a problem with my bass amp.

The amp is a Yorkville 200B. The problem is, when I plug everything in and turn it on the amp works fine, but after a short period of time (say 1 minute of playing) it starts to crackle/buzz that overpowers the actual notes. If don't let up and keep playing the sound crackling will build and build (think a crescendo) and then it cuts out almost entirely. I've concluded that it's not the bass or the chord as both work fine with other amps/guitars, so it has to be the amp.

Anyway, I think it's the actual input on the amp. I say this because if I apply pressure upwards on the chord where it enters the input (for example using my knee) it works fine.

Any ideas on how to fix the problem?

I opened it up last night, here are some pictures of insides:

Close up on the area around the input (the big black thing on the far right is the input):

http://remenaz.110mb.com/bass_amp/bass_amp_close_1.jpg

Overview:

http://remenaz.110mb.com/bass_amp/bass_amp_1.jpg

Thanks in advance for any help