Question about Fender Hot Rod Deluxe Guitar Combo Amplifier

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My fender hotrod deluxe still produces some sound with the volume at 0, no sound at about 1.5, then regular volume control on up. I know the clean channel sounded better before this problem started. I've replaced the pot with no change. Any suggestions anyone???

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  • thebrother May 11, 2010

    is this on both channels or one and which channels are not working??? sounds like a channel switching relay is bad. you can get one on ebay.. type in search for fender hot rod deluxe switch and you will see one that is black and rectangular has 8 pins, omron brand, 24vdc, 1521N1 0.6a @110vdc

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  • Fender Master
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There are FOUR controls that affect the volume of signals going through plus the tone controlling ones.
and your
You used the word "volume". Based on the schematic, and assuming you are talking about the control labeled "Volume" and not reverb, master or drive, I can give some hints.

OFTEN the resistance element in pots MAY have a bit of overtravel which can act like your unit, but USUALLY not as far upscale as yours appears..

If the control you are refering to is not the "Volume" but one of the others, then there are other things to look at.

The action you describe would be one of probablly an inverse signal leaking through and when you go up to 1.5 you are actually cancelling the leakage.

I SUSPECT you may have a cracked circuit board in the vicinity of the input jacks that is leaking the inverse phase of the input past the input triode tube stage.

Board cracks OFTEN occur near input jacks because people trip over cords... (save yourself by running cord through a handle before plugging in the plug)

This should be easy to find. Connect an audio generator to the input and use a scope to find the problem. Without a scope, use a capacitor to "ground out" suspected signal paths.

On the schematic they show a resistor (10 ohms) from ground near the input to the pot bracket. I have personally SEEN capacitive coupling to pot brackets feeding into the amps from this source sending in stray signals.

If this is connected to other equipment, a ground loop could cause problem, so test with nothing but the guitar connected.

Posted on Apr 30, 2010

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Hello, I own a hotrod deluxe. I take great care for it and never move it. Normally on the clean channel, the volume is regulated by the volume and the master. Today the amp sounded only half as loud as...


Do you turn on standby every time and wait for the tubes to heat up first? If you don't, it can severely damage the tubes.
But a common cause of this could be just old tubes. Like any other piece of technology, tubes get old. If you like to play your amp LOUD then they wear out a lot quicker. You have to replace tubes every now and then. Because I'm not there to check out your amp, I can't give you an exact answer but it sounds like that's the problem. This isn't always a bad thing. You can make the sound of your amp exponentially better with nicer, new tubes. Your amp has 12AX7 tubes. Very common tubes to use actually. I'm not sure what kind of music you play, I'm assuming mostly rock and blues. But here is a list of tubes and reviews on them.
http://thetubestore.com/12ax7review.html
This is how to replace a tube:
http://www.ehow.com/video_4438285_change-pre_amp-tubes-guitar-amps.html
Upkeep on a tube amp:
http://www.ehow.com/video_4438295_replace-tubes-guitar-amp.html
A note he doesn't make in the video is to dust out your amp. I use the compressed dust spray for the inside of computers.
So overall, stop turning up your amp to 11, make sure it's well ventilated and dust it out from time to time. Hope this helped.

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