Zip
November 29th, 2009, 06:08 PM
Just got the above amph today. The guy I got it from said the hum (quite loud & annoying) was there when he got it from the original owner.
When I turn the unit on, there's a loud hum - like a 60-cycle, sort of. It remains constant...volume pot doesn't increase the noise, channels don't make a difference. Nothing I do changes the volume/pitch of the hum. It's just there. Removed the chassis from the amph, and all wiring/etc. looks original & intact. I certainly don't mind jumping in this thing, and I have the schematics - I just don't know how to proceed to troubleshoot this.
Any thoughts or ideas (aside from comments on solid state & Crate being complete rubbish :poke )??
When I turn the unit on, there's a loud hum - like a 60-cycle, sort of. It remains constant...volume pot doesn't increase the noise, channels don't make a difference. Nothing I do changes the volume/pitch of the hum. It's just there. Removed the chassis from the amph, and all wiring/etc. looks original & intact. I certainly don't mind jumping in this thing, and I have the schematics - I just don't know how to proceed to troubleshoot this.
Any thoughts or ideas (aside from comments on solid state & Crate being complete rubbish :poke )??