buzz takes over, and then the amp has to be turned off, but the problem persists. I've tried several guitars, several cables, and this happens on all of the channels. Any idea as to what this could be? The tubes are fine, and i had a show tonight in Hollywood, which made this problem more frustrating than anything!!! It sounds like i unplugged the guitar, while the cable was still plugged into the amp, and then grabbed the cable with my hand!!
Music - Fender - Hot Rod Deluxe Guitar Combo Amplifier
Answers & Comments
You say the "tubes are fine" I take it that you have either replaced them with new or used a very sophisticated tester on them. A heater-cathode short might cause the symptom. There are a bunch of tests I would want you to run alnd get back to me with the results.
Heat up the amp but DO NOT play anything into it for the usual failure time or more and they start to play i... did hum occur WITHOUT playing? With all volume controls down does the hum occur?
The right tools is an oscilloscpe to fing out if the filter caps are good. These are C31, C33, C35, C36.
With hum present in failed stater, plug in a grounded plug into the power amp in jack... if hum is stiil there, check the +/- 16 volts regulating Zener for ripple. get schematic here:
http://elektrotanya.com/fender_hot-rod-deluxe_sch.pdf/download.html