Solid State Guitar Amp Forum | DIY Guitar Amplifiers

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

Well, both pages missing ...
Anyway, you probably have either: cracked solder or cracked tracks where the jack meets the board or very close by, or the jack itself is bad/worn/bent.
Put on your best glasses, use good light and take a good look therte.
Repost your close-up pictures.

Sorry about that, here's a different upload of the close up:

http://h.imagehost.org/0952/bass_amp_close_1.jpg

Ok, look under that board, where the jack is soldered.
Resolder all pads, using a good, clean, hot, soldering iron and *a little* of good quality solder.