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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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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  • 1138 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

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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!

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/cameron_463100ffd54b591d

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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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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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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That unit has a digital reverb and tremolo that can not be turned OFF with your foot control, meaning this small sound card is always on. Even though that level is on "0", it is still always on. If it has a problem within it, it will put noises into your sound. I would recommend opening the amp, look for the power to the effects card and unplug it to see if it goes away. It should be a small card resembling a sound card from a computer mounted off to the side. It should have a red and a black wire plugged into it. Wiggle it and listen for a change, dirty connections on that plug could do that. Unplug it completely and listen. This would only remove the possible interference of the card, you would still have sound without effects. Regardless of the brand, those cheap effects cards are usually more trouble than they are worth. They only have a few samples of effects, not the actual effect. I hope this helps, I know it is a great sounding amp but, those effects cards are the weakness of amps today.

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2 Answers

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

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/lisa_52daba487e5b4d53

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1 Answer

After a gig last night we tried our Marshall JCM 2000 DSL401and it had developed two noises without anything plugged in. The first is a transformer hum that I'd never noticed before and when standby is...


Likely the filter capacitors have a problem. Best to take this in for repair... it is ODD that there is noise with the standby switch is in standby... That makes no sense... In standby it appears that power is removed from the power amp high voltage so nothing should come through the speaker... Unles maybe one off the power tubes had a total meltdown which should have blown the fuse.

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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.

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Microphonic tubes can be detected by tapping them lightly with a pencil. I cannot find if this uses a spring reverb, but if it does, vibrating the cabinet will get a clanky type sound from the reverb tank. This MAY use a digital reverb however which is immune to that. Next thing is to make sure your guitar can't "hear" the output sound of the amp because the strings can pick up the sound and resonate feeding back into the amp. You can detect if this is happening by quickly dampening the strings and see if ringing gooes away. You probably need 6 to 10 feet of clearance between the guitar and the amp OR put your body between the amp and the guitar. ALWAYS set sound level at safe levels. Get a sound meter and go no higher than 90 Db. I know a lot of near deaf musicians whose careers are near over because of hearing loss using too high level.

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