Question about Fender Hot Rod Deluxe Guitar Combo Amplifier
When I switch from "standby" to "on" after a break, i get this very loud drone. The amp registers no signal from guitar. The only way to undo this is to switch the whole unit off for a while. Now it's starting to do this even without using the switch. It will just cut out my guitar and start doing the loud hum.
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Posted on Jan 02, 2017
SOURCE: fender M-80 electric Guitar Amp.
You might have a ground problem. Does it do it in different outlets or when you take it to someone else's house? One easy solution to ground problems can be running a three prong to two prong adapter on the power cable. Give that a try and see if it helps.
Posted on Nov 10, 2008
There is a protection thermistor in the circuit to keep it from over-heating, this is why it works again when it cools. Check and make sure you are not covering any ventilation holes, or if the unit has a fan, make sure it is working.
Posted on Aug 22, 2009
It sounds like a filter capacitor(s) has failed. The electrolytic caps dry out and cease to perform allowing unfiltered power to reach the preamp sections and get amplified.
Being this is tube with high voltages, an experienced person should work on it due to shock danger.
I assume you checked the tubes for shorts as well as emission since a heater to cathode short could cause this as well.
Posted on Sep 30, 2009
Testimonial: "Thanks man. and thanks for the fast response"
You likely have a bad input jack. A VERY common thing with these. They don't like to work on the jack because one has to remove too much to replace it. Lazy shop! Sometimes the solder has just broken loose or the board pads damaged. Replace the jack anyway as they take a beating.
Find a shop willing to work on it properly and DON'T accept it back until it is fixed!
Another problem with amps can be the preamp output jack switch which fails to close leaving the amp dead... but it usually won't hum much when that happens.
HINT: Loop your instrument cord through the handle so when you trip and yank on the cord it won't break the input jack... saves a lot of jack repairs!
Posted on Mar 29, 2010
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