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Can you please advise? My Fender Blues Deluxe re-issue 180W has a humming buzzing sound which is not clean. Yesterday I used it, was fine and turned it off. Today I have the buzzing problem.

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Posted on Jan 02, 2017

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SOURCE: Constant hum/buzz only when the distortion is

Distortion is a very HIGH gain operation and any hum on the input will be amplified many times.

Check your guitar AND input cable for ANY hum at all at high gain settings on the amp WITHOUT the pedal in line to assure that the source is not before the pedal.

ADDITIONAL cause could be a poor power adapter for the pedal or even a bad filter cap in the pedal.

Posted on Nov 03, 2009

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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!"

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SOURCE: loud humm when the drive channel is on

I suspect the power supply has an issue. Most likely bad filter capacitors. This could cause "motorboating" where power is drawn and supply voltage collapses and then recovers repeatedly.

Time for the repair shop. The parts cost should be nominal... labor... well...

Posted on Mar 16, 2010

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SOURCE: I Have the fender 212 soild state amp.When I plug

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

  • 73 Answers

SOURCE: My Fender Blues Deville 212 has a very "ratty" tone on clean...

i am guessing on what the problem is , the post is very vague. i am guessing a channel switching issue. you need to check the "sugar cube" looking power resistors solder welds. they are probably cracked and arent making good contact. if you tap on the amp it will cut in and out, its probably these two resistors. they are usually 470ohm 5 watt cement resistors. what happens is they get real hot, and as they cool down they crack the little solder welds. i usually replace them with new and keep them floating up over the pcb to help them stay cool and off of the board to prevent further solder weld cracking, stock they are real close to the board. then put a little silicon under the resistor to hold it in place and to keep it still on the board. i just fixed a blues deluxe with this issue. while you are in there, cut out the resistor sitting right behind the reverb pot, this will make the reverb awesome. also solder the mid pot center leg to the mid pot leg that comes off of the bass pot leg to get better midrange control. very easy mods. check the master volume pot, is it a B100K? pull it and put an A250k in its place for better volume control. bias pots , etc. check my website yostamplifier.com.

Posted on May 04, 2010

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I replaced Can I change the tubes on my fender blues deluxe reissue from 6l6 to 6v6 power tubes


An internal component has failed. Without it in front of me for testing I cannot say which. You need to takje it to the repair shop.

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Why is my Fender Blues Deluxe Amp making a crackling sound without an instrument even plugged into it and when I do plug in, it quiets when I touch any place on the guitar?


You probably need a new input jack on the amplifier. When they get loose the connecting wires can crackle, but plugging a guitar in stabilizes them (no more crackle).

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Try tapping the tubes (especially the small ones) lightly with a regular wood pencil and see if you can detect noise. Also verify your guitar AND cable are not the source of the noise by using them on another amp. Verify that popping exists witout guitar cable being plugged in.

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The amp plays fine for about 15 to 20 minutes, then an extremely loud, over powering hum/buzz takes over, and then the amp has to be turned off, but the problem persists. I've tried several guitars,...


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

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My fender hot rod deluxe is buzzing


Is it the amp for sure? You need to try these things first :

Plug your guitar and lead into another amp. Does it buzz?
If so, Change the guitar lead with a NEW ONE.
Still Buzzing? Your guitar needs attention.

Ok so if it's not noisy in another amp, turn on your fender with nothing plugged in. It should be silent? Is it? If not, check to make sure no ones messed with the earth lift switch.
Next, you should try it off a different ring main. If you have upstairs sockets and downstairs sockets, they should be (but not always) on a different ring main. Try it? If you live in a flat for example, or are unsure, try it round a mates house. If it's noisy off one ring and not on the other, you have some mains interference from something else plugged into the ring main and it's not your Amp.

Is it still noisy?

Well so far, I'm hoping you have been using it all Clean and direct with NO FX Pedals and such like. These thigs can add numerous buzzes and hums to any rig. Again break it down, try each one by one until you get the rid of the buzz.

If after all this, your Fender is still being noisy, you can safely take it to your nearest music store to get it repaired without feeling like a plonker :-)

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You can plug the output of the gt10 into the "power amp in" jack of the Fender. This bypasses the preamps in the Fender but uses a buffer amps in the Fender to drive the power amp. Please note that the reverb is STILL in the circuit when you do this. You can turn the reverb to zero if you wish to disable it.

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2 Answers

Loud humm when the drive channel is on


I suspect the power supply has an issue. Most likely bad filter capacitors. This could cause "motorboating" where power is drawn and supply voltage collapses and then recovers repeatedly.

Time for the repair shop. The parts cost should be nominal... labor... well...

Mar 15, 2010 | Fender Hot Rod Deluxe Guitar Combo...

1 Answer

My Fender Blues Deville 212 has a very "ratty" tone on clean...


i am guessing on what the problem is , the post is very vague. i am guessing a channel switching issue. you need to check the "sugar cube" looking power resistors solder welds. they are probably cracked and arent making good contact. if you tap on the amp it will cut in and out, its probably these two resistors. they are usually 470ohm 5 watt cement resistors. what happens is they get real hot, and as they cool down they crack the little solder welds. i usually replace them with new and keep them floating up over the pcb to help them stay cool and off of the board to prevent further solder weld cracking, stock they are real close to the board. then put a little silicon under the resistor to hold it in place and to keep it still on the board. i just fixed a blues deluxe with this issue. while you are in there, cut out the resistor sitting right behind the reverb pot, this will make the reverb awesome. also solder the mid pot center leg to the mid pot leg that comes off of the bass pot leg to get better midrange control. very easy mods. check the master volume pot, is it a B100K? pull it and put an A250k in its place for better volume control. bias pots , etc. check my website yostamplifier.com.

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