Reverb gain on Fender Princeton 112+ - diyAudio
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Old 17th July 2013, 07:44 PM   #1
diyAudio Member
Join Date: Jul 2013
Default Reverb gain on Fender Princeton 112+

I picked a '90's Princeton 112+ "project" amp. Replaced knobs, reverb pot and spring reverb tank.

Two issues I'm hoping someone can assist me with:
1. At "zero" position on reverb pot there is no reverb. On "one" I get full reverb. No difference between 2 and 10.
2. The amp (reverb off) seems quite "hissy" to me.

Any suggestions (other than scrapping the amp!) will be greatly appreciiated!
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Old 17th July 2013, 08:17 PM   #2
diyAudio Member
Join Date: Dec 2005
Location: Germany
I assume you already got the schem and the manual.
Just in case not:

As to problem 1: Sounds suspiciously like "wrong pot" that means either
wrong resistance (It should be 50 k) or wrong taper (>"B")
since this product is of (more or less) US-origin this should be a "linear" one , not one with audio/log tape. (In Europe this is someway different)
As to 2) : Right now I can only guess.
I'd check first: what else did you replace ?
then : Proper solder joints
then: all small caps back in place correctly ?

Hope this helped.


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Old 18th July 2013, 12:36 PM   #3
diyAudio Member
Join Date: Jul 2013
Thanks SigFire. I'm pretty sure I got the correct pot but definitely worth checking. I'll check those other suggestions as well.
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Old 21st January 2014, 04:27 PM   #4
JayZ is offline JayZ  Canada
diyAudio Member
Join Date: Dec 2004
Location: Paris, Ontario, Canada
Finally got around to opening up the P112+ to start the MODS you all have been helpful to suggest. Of course I wanted to check out my reverb problem again. I found the problem. When I initially removed the PCB a few months ago I intentionally cut the the reverb send-rec cable to make it easier to remove the PCB. When I soldered back together I assumed (I know- never assume) that the "grounds" were common. I checked the schem today and nope - they are not common! Voila! Reverb working!
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