Question about Fender Hot Rod Deluxe Guitar Combo Amplifier

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I have a Fender Hot Rod Deluxe without foot switch, can I modify an old marshall or peavey footswitch to work.

Footswitch lost, can I modify a marshall or other 2 button footswitch to work it.

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Posted on Jan 02, 2017

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SOURCE: Fender Hot Rod Deluxe Footswitch

Main thing to verify is that the particular footswitch and cable you have is specifically for that amp. If it is not the right one, that is your problem as there is very little compatibility among footswitches.
Looking at the schematic, plugging in JUST the cable shifts operation as you observed. This uses a crazy circuit in which AC is applied on the cable and the footswitch has a diode each direction that causes the amp to shift between the states. when you plug a bare cable in, it disconnects the internal diodes and switches for control at the amp, hence the signals float.
You should investigate the footswitch to make sure it is the right type with the diodes resistors and caps that is for the Fender Deluxe.

You can find the schematic for the amp here:

http://www.fender.com/support/amp_schematics/pdfs/Hot_Rod_Deluxe_Schematic.pdf

Look at the circuitry of the switches on the schematic at C8. Your pedal should have similar circuitry. Assuming your cable is good, the problem would be in the pedal itself.

Posted on Jan 02, 2010

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1 Answer

While playing through this amp I stepped on the channel changing footswitch and lost all sound from amp. all tubes and pilot light remained on but amp went silent. Disconnecting footswitch and cable f


Plug the guitar on the "power amp in" jack near the "presence" knob.
If you get sound, you have a problem on the preamp. If not, it´s probably on the power amp section.

Its a good start...

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On the MG30FX, it wont stay in overdrive sometimes. I push the switch in, then it will go back to clean automatically.


There is a possibilty that switch contacts on the footswitch jack are dirty if you are NOT using the footswitch. If you ARE using the footswitch, then an intermittent cable or static charge build up may be causing this.

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Using the CORRECT footswitch for this model, you just plug it into the footswitch jack. You MUST use the correct one for the model.

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Without more info can't be much help. IF you are using the foot switch, poor contact of the plug AND also of the switch contacts of the footswitch jack will lead to intermittent reverb. There are MANY components that can cause the problem, including some may be temp sensitive... you need to characterize what MIGHT be changing in the environment. Also does vibrating the unit cause any change? You could even have a loose connection or bad cables that goes to the reverb tank...
This may take electronic test equipment to find the cause. COuld be failing component, crack on the circuit board, bad connector, cable...

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1 Answer

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The circuitry for the channel switching is rather messy; Here is schematic:

http://elektrotanya.com/fender_hot-rod-deluxe_sch.pdf/download.html

I would first suspect the foot switch jack assuming you are not using the footswitch. There are many components but switch contacts, especially on the jack are very suspect.

It will take a little patience to find the problem... vibration can rattle the contacts or any loose soldering.

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1 Answer

My 94 blues deluxe switches channels by itself .happens occasionally.it will switch to the overdrive channel, then a few seconds later switch back to the clean channel.


IF YOU ARE USING the footswitch, then likely problem is with cable and or the pug and jack.

IF YOU ARE NOT using the footswitch the contact switch on the jack for the footswitch is PROBABLY intermitent contact. These jacks are POOR quality in the music equipment. If this is the case in yours, open the unit and tighten the spring contact.

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1 Answer

Fender Hot Rod Deluxe Footswitch


Main thing to verify is that the particular footswitch and cable you have is specifically for that amp. If it is not the right one, that is your problem as there is very little compatibility among footswitches.
Looking at the schematic, plugging in JUST the cable shifts operation as you observed. This uses a crazy circuit in which AC is applied on the cable and the footswitch has a diode each direction that causes the amp to shift between the states. when you plug a bare cable in, it disconnects the internal diodes and switches for control at the amp, hence the signals float.
You should investigate the footswitch to make sure it is the right type with the diodes resistors and caps that is for the Fender Deluxe.

You can find the schematic for the amp here:

http://www.fender.com/support/amp_schematics/pdfs/Hot_Rod_Deluxe_Schematic.pdf

Look at the circuitry of the switches on the schematic at C8. Your pedal should have similar circuitry. Assuming your cable is good, the problem would be in the pedal itself.

Jan 01, 2010 | Fender Hot Rod Deluxe Guitar Combo...

1 Answer

My 100hdfx has a problem switching channels. Both overdrive channels work fine but the clean channel is none existant. If you switch it to the clean channel and turn it up all the way you can faintly here...


have you tried the footswitch to change channels. also. my amp has to be in channel 2 position (with the button on the head) before i can use the footswitch. sometimes the input/footswitch jack wears out and you need to bend the internal tip/ring tabs of the jack to make better contact. also like on my fender amp, i had just a standard mono instrument cable going to my footswitch and it was acting wierd cause it needed a stereo instrument cable. one last thing on the grounding resistors on the pcb, they get hot and break the solder welds which messes with all sorts of stuff in amps. usually look like sugar cubes , cement resistor. 5watt usually under 1k ohm. check for bad solder welds on the pcb where the big resistors are and the switches/buttons and at the footswitch. there may be a bad ic or transistor for the channel swithing

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2 Answers

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If the footswitch is not switching correctly, open it up and check for any shorts or a defective switch. Sounds like it's a problem with the switch.

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