Question about Fender Frontman 212R 100W 2x12 Guitar Combo Amplifier

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My reveb tank on my fender Fm 212R is causing a siren like noise

If the reverb is set above 1 or 2 there's a siren like noise and this noise gets louder as i turn up the reverb if you unplug the red and white Rca plugs from the reveb tank the sound goes away and the amp works fine but then i have no reverb what is wrong with my reverb tank?

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Posted on Jan 02, 2017

  • 1137 Answers

SOURCE: Hot Rod Deville, reverb squeal...

Here is an article that might help:http://www.guitarplayer.com/article/reverb-troubleshooting/jun-09/97165 Here is the schematic:http://www.fender.com/support/amp_schematics/pdfs/Hot_Rod_DeVille_Schematic.pdf Check to see if someone hasn't reversed the input and output cables at the reverb tank. Then troubleshoot the reverb section .

Posted on Aug 29, 2009

criss_michae
  • 63 Answers

SOURCE: my reverb on my Fender

Your reverb spring is most likely broken. If it has electronic reverb, then the chip has gone out. For both of these problems, a qualified amplifier technician will have to look at it and replace the parts.


Hope that helps!

Posted on Feb 13, 2011

  • 5603 Answers

SOURCE: I have a Frontman Fender 25R, it has a power, the

You actually have the "B" version as the original 25R doesn't have RCA jacks. Anyway, on with your problem...

I want you to do a test: With a set of headphones plug them into the preamp output and then play your guitar... don't expect much loudness, it may be very faint and will ONLY be in one of the sides of the headphones. This tests the preamp section... have the guitar volume wide open.

IF you can hear the guitar that way, then the switch contact on the PA INPUT jack (not the preamp output) is not making contact. These jacks are really poor and the problem is not that uncommon. Fix is to open the unit and increase the spring tension on the contact or replace the jack. Never use the jack as they worsen evertime you plug something into it.

Note that the failing switch symptom MAY be broken soldering in the vicinity of the jack so look for that also. And also check the soldering of the guitar input jack as that is a common problem. Always loop your guitar cable through the handle so tripping over the cable doesn't break the jack by yanking the plug sideways... another common problem.

Posted on Mar 25, 2011

  • 5603 Answers

SOURCE: Hey, I brought my Fender

Your amp uses a "reverb tank" that has two or three springs that are suspended. One end of these springs are driven by a transducer and the other end the vibrations are picked off with another transducer. If you dropped the unit, possibly the two cables that go to this tank on the bottom of the cabinet have come loose. other possibilities are the transducers have been damaged... or one of the cables has broken or the electronics that drives this and receives the return has broken. If you are not electronically adept, the only DIY is to check that the cables that plug into the reverb tank at the bottom of the cabinet are connected. The tank is often covered with black cloth like plastic and the cable have RCA type plugs that plug into it.

Posted on Oct 05, 2011

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I have a '93 Fender Blues deluxe tweed and don't seem to have any reverb, am I missing something?


Check the connection to the reverb tank (rectangular box usually sitting on the bottom of the amp). There are a pair wires that connect it to the amp. If wires are connected, and the reverb is not working, you may need to replace the reverb tank.

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What speaker do's fender use in the fm 212r


I beleive those are made by Eminence. If you look at the frame edge, you'll see a string of numbers. If the number starts with 67-, it's made by Eminence.

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Is there a way to make the sound of the reverb on my deville 2-12 sound better ?


modding the reverb takes some electronics experience...if you know where the reverb circuit is. all you can really do is change the input caps that make the tone bright or dull... larger uf for dull... lower cap values for bright... it's in the signal circuits... dont mess with power caps. The schematic shows op amp into the tank and out of the tank to another op amp...Output of the tank to opamp.. Id double that input cap ( 330 pf ) to see if you get more response into the opamp... then look at the circuit C17-C18/R33-R34 894cf4a0-46f7-4f21-9667-be620f05b31d.png

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Hello! I was recently playing and found out then whenever I play specific notes on any of my guitars, my Fender Frontman 212R will buzz. The notes that always buzz are drop C, drop C#, any A note, and...


There is something resonating with that note frquency. Often the grille or wiring inside will rattle at certain frequencies. You need a sustained source of these frequencies to find what is causing the noise.

Aug 25, 2011 | Fender Frontman 212R 100W 2x12 Guitar...

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My crate FW120HS has suddenly started giving me loads of reverb, and i have no idea why. Iv not changed any effects or my set up. Its just suddenly happened. Any Ideas?


This has a digital reverb unit. The settings are subject to get clobbered I suspect. I don't know if you are using foot switch for the reveb control... You may also have a cable that has come loose...

Here is a link to schematic for your unit:

http://elektrotanya.com/crate_flexwave_guitar_amp.pdf.pdf/download.html

Notice that the reverb is set by DC voltages from teh setting pots that go to the DSP chip. These setting pots receive voltage from a 16 volt ZENER regulated source. First thing is to CHECK that voltage. If the Zener has opened and you find much over that 16 volts, that is your cause of the problem.

The circuitry is on page 1 in the 3B to 3D lower left of the page.

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2 Answers

If I strum harder on my guitar a buzzing noise comes out of the amp. Also every sound I try on the amp sounds very twangy and painful to the ears. I use an overdrive pedal with it, but every setting is...


If you don't want distortion, get rid of the overdrive pedal... Twangy USUALLY comes from the GUITAR and NOT the amp... test it on a different amp to decide... Buzzing CAN be caused by "fret buzz" which is due to IMPROPER guitar setup such as neck bend and string height.
Start using ONLY clean channel on the amp and NO reverb. If you verify that the guitar sounds bad on a different amp, take it in to have it setup properly.

Feb 10, 2011 | Fender Frontman 212R 100W 2x12 Guitar...

1 Answer

Hey, I brought my Fender 212R back frm a gig the other day and when i turned it on last night the reverb was dead, simply not working at all. I checked the back of the tank and its plugs were firmly...


Your amp uses a "reverb tank" that has two or three springs that are suspended. One end of these springs are driven by a transducer and the other end the vibrations are picked off with another transducer. If you dropped the unit, possibly the two cables that go to this tank on the bottom of the cabinet have come loose. other possibilities are the transducers have been damaged... or one of the cables has broken or the electronics that drives this and receives the return has broken. If you are not electronically adept, the only DIY is to check that the cables that plug into the reverb tank at the bottom of the cabinet are connected. The tank is often covered with black cloth like plastic and the cable have RCA type plugs that plug into it.

Jan 10, 2011 | Fender Frontman 212R 100W 2x12 Guitar...

2 Answers

Amp is little used and now the reverb is not working. It is never moved from the room where I play.


There are only TWO op-amps and the tank involved with the reverb. Both of those are in one IC chip labeled "U2". It is a TL072.

Pin 1 of that chip is the output to the tank and pin 7 is the inout of the reverb control pot that then goes into the power amp.

They resistively mix the delayed reverb signal with the straight signal at the input of the power amp.

I assume you have turned up the reverb control which is just a volume control for the signal going through the tank.

There are so few parts involved with this that a failure is really rare.

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