I just purchased a used KB-100 Keyboard Amplification System.
3 Channel Input, with pull Gain
4 Channel EQ
Seriel #: 7A-02815100
Number in bottom right of tag is 87A
I played it for a bit to test it, and it sounded excellent. At this time it was extremely dusty, so I pulled the speaker, spring reverb and amp out so I could blow it out with compressed air.
I then proceded to wipe down the exterior (cabinet only) with an armorall dampened rag to shine it up.
When I put the system back together and started to play it, the speakers now crackle badly, as if they were blown..... (This happens when run through any channel, so this problem has to be common to the 3 channels.) To make sure I hadnt damaged the speakers, I connected them to another amp (same ohmage and wattage) and they test out fine...
Next I connected the amp itself to another set of speakers and the other set of speakers makes the same rattling sound so I know for sure it is indeed something to do with the amp. Again, it must be common for all 3 channels, as it happens with all of them.
I also noticed that when nothing is plugged in, and the 4 channels on the EQ are maxed (this is while I was testing it) that the compressor comes on and (inside the cabinet, center of the heat dissipator) the compressor makes a very high pitched whine (I have really good ears, my wife cant hear it).
Is there possibly some way to bypass the compressor to see if it is what is causing the problem?
Any Ideas as to the solution to this problem (Please dont tell me to purchase a new amp, as I just got this one and would like it fixed, as its just the right size.) would be appreciated.