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Fender hot rod deville 212 problems

My friends dad hooked his stereo up to my amp and used the clean channel which was at 1.  When switched to the overdrive channel which was at level on 12 the amp  cut out.  
Now the amp works fine except it doesn't get loud.  When all the channels are up all the way it leaves the speakers as if the levels were at 1.
I checked the fuse and it was fine.  Could this be a diode? are my speakers blown? help please

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Posted on Jan 02, 2017

PolyrhythmFX
  • 109 Answers

SOURCE: Fender Hor Rod deville footswitch

If the footswitch is not switching correctly, open it up and check for any shorts or a defective switch. Sounds like it's a problem with the switch.

Posted on Aug 14, 2009

  • 5603 Answers

SOURCE: Deville 212 overdrive channel making Loud humming noise

It sounds like a filter capacitor(s) has failed. The electrolytic caps dry out and cease to perform allowing unfiltered power to reach the preamp sections and get amplified.

Being this is tube with high voltages, an experienced person should work on it due to shock danger.

I assume you checked the tubes for shorts as well as emission since a heater to cathode short could cause this as well.

Posted on Sep 30, 2009

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SOURCE: How do I fix a blown op amp on fender hot rod deville 2x12?

Unless the person that analyzed this problem used an oscilloscope and did detailed troubleshooting, I would NOT jump to the conclusion that aan op amp was blown BASED upon my looking at the schematic of the unit. There are MANY components involved with the overdrive channel, including relays and other transistors and components. The most probable caause would be that 1/2 of the V2 vacuum tube is burnt out. Test by swapping V1 with V2. If NOTHING works, then replace the tube that is NOW in V1 as the second section of it has a burnt out heater. Also a bad potentiometer for the OD channel would be a suspect. A VERY common problem is broken solder at pot terminals. Try plugging a set of headphones into the preamp output. See if you can hear sounds in bothe OD and clean channels. Note you will only hear sound in the LEFT headphone as the preamp out is MONO. MOST of the three op amp chips would NOT kill the OD signal if they were bad.

Posted on Oct 01, 2012

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