Question about Crate FlexWave FW15 Guitar Amp Combo, 15 Watt Single 8 Speaker

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

This is the battery operated Limo. I get a high frequency continuous tone when the rotary dsp pot is turned to by-pass. Get static when rotating thru the effects. Can someone point me to a suspect part? I have reflowed the majority of large solder joints on the pcb's. Any suggestions?

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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.

Posted on May 03, 2010

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Sounds like your pots are dirty. You need to spray a cleaner such as Deoxit in the pots then rotate them a few times..This has to be done with the power off and the amp unplugged from the wall...Remove the knobs, get some food grade plastic hose which will be a snug fit when shoved on over the shafts of the pots...make sure to cut a piece off the hose about one inch in length...spray the cleaner into the hose and then with the hose still shoved down over the shafts rotate the shafts back and forth a few times...Then power up the amp and recheck...This will only work if the pots are not gone beyond the point of no return..Outside of that, they will need to be replaced which means you will have to disassemble the unit...

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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?

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Here is a link to schematic for your unit:

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Dirty high switch on a Crate practice amp

NEVER use switch cleaner such as DeOxit on pots !!!!!

I have used CRC226 available at Home Depot electrical dept.

I SUSPECT that the resistance element in that pot is cracked. This is common if the knob sustained a hit. Replacing the pot is the only cure if the element is cracked.

Reviewing the schematic, ALL audio passes through the wiper on the HIGH tone pots. If the wiper is intermittent, so will be the sound.

If your unit is solid state amp, the pot looks like a 10K ohm LINEAR taper.
If you have a tube type, then the pot is a 250K ohm LINEAR.

Note that the other tone pots in the units are AUDIO tapers, but the high is a linear taper.

Get repair parts from either or

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1 Answer

Have a crate limo tx50 d some times the effects stop working and or get a buzz from the unit

An educated guess is that you have a cracked circuit board or a bad solder joint. OFTEN the boards crack or traces get lifted or solder broken near pots such as volume control, etc.

Another place to look is the connections where jacks are soldered... those are chronic failure points.

One other problem is the bypass switches on the effect insert jacks. The contacts of the switch part of the jack get oxidized or bent.

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