Question about Fender Hot Rod Deluxe Guitar Combo Amplifier

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Fender hot rod deluxe noise - Fender Hot Rod Deluxe Guitar Combo Amplifier

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Posted on Jan 02, 2017

  • 11 Answers

SOURCE: Fender Hot Rod Deluxe making popping noise

Ah yes, the Fender Hot Rod Deluxe. I have seen more of these in my shop than any other amplifier!! I have even sent recomendations for design changes to Fender about this amplifier.
Sadly, your amp tech may be correct: while the amp is within working specs, you can still have an issue with a bad socket. The cheapest thing to try is to replace the preamp tube(s) you think may be causing the problem. If the problem persists, it may need to be serviced on this issue (by a different 'certified Fender tech'). In defense of the last tech you had work on this amp, these amplifiers have a brittle design and do not gig or travel well (there are a minority of these amps made that do perform). Fender tried to do too much for the price on this model: best advice is to fix it, sell it and get your tone with a more stable model made by Fender (like the new vintage re-issues). Fender, like Marshall, has for years been having problems when they get too far from thier 'working reciepe' of what made them great companies.
You likely have a socket that needs re-tensioned, or a preamp tube not behaving. If it is not these, then a tech had to dive in the house of cards that is this circuit. Sorry for the bad news on this, but it is the truth. I only take on Hot Rods that 'appear' to be fixable. I am a development engineer, build amps from scratch and fix them for the local music shops, and my success rate is a dismal 60%-ish percent on these...
Thanks,-mike

Posted on Mar 30, 2009

  • 5603 Answers

SOURCE: I have a Fender Hot Rod Deluxe. It has very few

First try turning the volume control down before turning switch to operate.

IF this seems to fix it, IF the unit has a tank reverb, the vibration of the reverb springs MAY be causing the problem. The solution then is to reduce the volume before applying power WHICH is a good idea anyway... from an electrical engineer.

Posted on Jul 26, 2009

  • 506 Answers

SOURCE: Fender Hot Rod Deluxe. Turns on, sounds very good

More than likely a bad solder joint. Where is the next question. How confident are you with voltage measurments? The rails in tube amps are high and can kill you so if you are not inclined to do so please don't. The reason I suspect a solder joint is that it is a failure over time, cold solder joints expand and contract with heat. When they heat up they break connection. Not saying 100% that is your problem but it is very likley.

Posted on Dec 14, 2009

Testimonial: "Hey thanks for responding!...I am not savy at this so I will take it to an expert before those tuibes blow on my face. Thanks again!"

  • 5603 Answers

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

  • 417 Answers

SOURCE: fender hot rod deluxe tube rattle.

poosibly the tube sockets are not holding the tube in place anymore. Usually the Fender's have a spring loaded carriage so to speak that hold tubes in place.

Posted on Apr 01, 2010

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Fender Hot Rod Deluxe. Works great except when I turn the amp off it crackles pretty loud. It takes about 5-10 seconds for the crackle is heard. If I turn the standby switch first, then wait a minute or...


As voltages drop, electronics gets unstable as it goes down and becomes noisy... this may be the nature of this beast. Opening the standby might be the best way to avoid the problem.. Here is your schematic for service:

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

Scroll down to "get manual" and click to download. IGNORE other download links.
Opening the standby switch turns off power to the main amp so noise generated in the preamp will not be amplified.

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This often due to a cracked circuit board or bad solder joint. Sometimes input connectors are bad but those are easily discovered by wiggling the plug.

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When I turn on my fender hot rod deluxe 40W, even before plugging in my guitar, it crakles and makes noises constantly. I've had it for over 5 years and I play it maybe 1 hour a week. Is it a tubes issue?...


This is likely either a tube issue OR one with capacitors.

You need to characterize the loudness of the noises versus the settings of the controls as part of troubleshooting...

You can try tapping each tube with a pencil to see if one in failure will reveal itself.

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3 Answers

Fender hot rod deluxe tube rattle.


Fender hot rod´s have an common problem on the plate resistors of the preamp and phase inverter tubes.

Check if the 100K and 82K resistors on the tube socket board are not brown. Those resistors usually need to be changed to bigger ones 1/2W.

this guy made a good document about this fix:

http://home.comcast.net/~fredholz/Justin-Holton/Fixing%20Loud%20and%20Intermittent%20Crackle%20or%20Static.pdf

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

2 Answers

I have a Fender Hot Rod Deluxe. It has very few


First try turning the volume control down before turning switch to operate.

IF this seems to fix it, IF the unit has a tank reverb, the vibration of the reverb springs MAY be causing the problem. The solution then is to reduce the volume before applying power WHICH is a good idea anyway... from an electrical engineer.

Jul 24, 2009 | Fender Hot Rod Deluxe Guitar Combo...

1 Answer

Fender Hot Rod Deluxe making popping noise


Ah yes, the Fender Hot Rod Deluxe. I have seen more of these in my shop than any other amplifier!! I have even sent recomendations for design changes to Fender about this amplifier.
Sadly, your amp tech may be correct: while the amp is within working specs, you can still have an issue with a bad socket. The cheapest thing to try is to replace the preamp tube(s) you think may be causing the problem. If the problem persists, it may need to be serviced on this issue (by a different 'certified Fender tech'). In defense of the last tech you had work on this amp, these amplifiers have a brittle design and do not gig or travel well (there are a minority of these amps made that do perform). Fender tried to do too much for the price on this model: best advice is to fix it, sell it and get your tone with a more stable model made by Fender (like the new vintage re-issues). Fender, like Marshall, has for years been having problems when they get too far from thier 'working reciepe' of what made them great companies.
You likely have a socket that needs re-tensioned, or a preamp tube not behaving. If it is not these, then a tech had to dive in the house of cards that is this circuit. Sorry for the bad news on this, but it is the truth. I only take on Hot Rods that 'appear' to be fixable. I am a development engineer, build amps from scratch and fix them for the local music shops, and my success rate is a dismal 60%-ish percent on these...
Thanks,-mike

Mar 25, 2009 | Fender Hot Rod Deluxe Guitar Combo...

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