Question about Fender Fm25dsp 1x10' Guitar Combo Amplifier

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I'm missing the volume pot and dont know which one to buy. Its a champion 30 dsp fender guitar amp. Thanks

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Fred Yearian

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  • 5,603 Answers

There are two volume controls. One is "drive volume" the other just "volume"

The plain volume control is a 50K ohm, linear taper.(A) old marking

The Drive volume is a 100K ohm Log taper.(C) old marking

Find suitablel parts at DigiKey.com or Mouser.com or find a Febder repair center to order the part.

From other than Fender, You may have to shorten the shaft with a hacksaw to match your needs.

Posted on Jan 11, 2010

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My fender fm 65 dsp amplifier squeals and feeds back every time i turn it on


Is it plugged into a guitar at the time? If so, it sounds like you're using a speaker cable instead of an instrument cable. There is a big difference. Look on the cable to make sure. If guitar is not plugged in would be a completely different diagnosis.

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Usually with volume pots,the ratings dont matter. you can really buy then anywhere like guitar center,micro center and online. they're really cheap and well worth it.

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On my squier strat the volume doesnt come out through theamp at all[i know it's not the amp or cable cuz i've hooked others things up to it to make sure]. Everytime i push and hold the volume knob at 10...


It is not clear if the volume knob you are talking about is in the amp or the guitar... SINCE you said you verified the amp is OK I have to assume the volume control you are talking about is in the guitar and my answer is based on that...

I SUSPECT that the resistance element and/or the wiper in the volume pot is damaged. One other possibility is the soldering of a wire to the volume pot may be bad. If you are competent with a soldering iron you could replace the pot yourself or take it to a competent guitar shop for repair. I would myself suggest you open the electronics and look for anything obviously wrong. I have ALSO seen one other problem where one lead of a pot is touching the CONDUCTIVE paint in the cavity where the controls are. If the shaft nut becomes loose and the pot slightly rotates this can happen, grounding out the signal.

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I have a fender guitar amplifier, and I can't get any low volume out of it. At level 1 on the dial the volume is sooo loud - no gradual increase at all. It's impossible to play softly. What's going on?


It sounds like (pun intended) the volume pot just needs to be replaced. A good pot is worth about $5 and then you just need to solder it in. That tends to be the tricky part if you can't solder. It takes longer to heat up the iron than it does to do the job. I'd assume this happened either after it had sat for quite a while or after a move.
What can happen is the wiper or the resist inside the pot breaksor even the wire to the pot breaks and there goes your volume control. Depending on what model of amp you have you don't want to run it like this for too long. You can't fix the pot but you do need to replace it. I would assume it sounds like it is either full on or doesn't change the volume at all.
This is one of those maintenance things you should check for from time to time. you may notice that the pots get noisy or inconsistent for a while and then they do this kind of thing.
The attenuator will kill the volume but that doesn't actually fix the problem you have. When the amp is running properly you should be able to get quite a low volume. If you need to run it harder so that it gets into the distortion range then a attenuator will drop the volume down to a practice at home non eviction volume ;-]

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1 Answer

Crate TX50 DB has noisy DSP circuit when rotating the DSP pot!


When you are changing the DSP effect on the fly, static or noise is NORMAL !!! The DSP is changing the data and having to recalculate on the fly and doesn't mute itself while doing so which results in "garbage sounds out".

The bypass setting should NOT get any tone UNLESS you have feedback going on. If your guitar can "hear" the speakers in the amp, the strings can vibrate and get feedback going.

Unplug the guitar and see if high freq tone is still there on bypass. If the tone is in the musical range, then there is a problem if nothing is plugged in. If it is a VERY weak, very high frequency tone, this may be the digitizing noise from the DSP. On bypass, the audio is likely to still go through the DSP, just not be modified by it.

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My Line 6 Amp has a sort with the volume, the volume will be low and for no reason shoot up to about 8 or 9. how do I fix it?


Sounds Like You need a new volume pot you can buy them at radio shack, Best buy, Click Here to see it. Its very easy to replace if you have soldering experience if not it should be to expensive to fine somewhere to do it for you.
Hope this helps and if you have more questions let me know.
Sincerely,
Michael Scott

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When i turn on my amp it makes a loud beeeeeeeeeeeeeeeep.


Turn the volume down.
Check your gain.
That should solve it.

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Low volume on acoustic and jazz amp type


Ok, so I hope you realize the Fender FM25DSP guitar amplifier is an "entry level" NON-valve amp with a DSP chip that has model shaping tones. I am sorry but this is a toy and Fender did not spend the tens of thousands of US dollars to have built-in tones that truly 'kill". This not digital modelling like Line 6 or Fractal Audio did and so you have a problem from the start. This amp was always intended as an entry level amp for the bedroom only and never to be used on stage.
Jazz and acoustic modes have some similarities requiring mid-range boost and some rounding. Not easy to achieve with a DSP chip that costs about US$10 to manufacture. Sorry, consider using the amp for practice but look at a more serious valve amps for live on stage

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