Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Jrusto on February 27, 2024, 06:01:24 pm
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Moving along pretty good on my PRRI to Hoffman Princeton Reverb build but have hit a snag.
I am trying to figure out how to the PRRI Rev/Trem pedal to work through a TRS system the PRRI came with. I think I just hook the Trem wire as I have it but the Rev confuses me.
On the PRRI both the Rev and Trem were on regardless of whether the pedal was plugged in or not. I kind of like that method of operation as I could just reach down and turn the knobs for the effect.
The PRRI also came with caps between the tip/ring and ground on both the Rev and Trem. I have them out in the photo and don't really understand their function.
So how do I go about hooking up the board to the TRS jack and where would the 220k resistor go. It is twisting my brain so I thought I would reach out for some help.
I have attached my amp build, a PRRI reverb schematic, and a link to the Hoffman Layout for reference. https://el34world.com/Hoffman/files/Hoffman_PrincetonReverb.pdf .
Thanks for your help
Rusty
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The 220pF caps look like contact snubbers, probably to prevent a "pop" when the foot switch is operated.
I'm not sure which 220K resistor you're discussing. What's its part #?
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You don't need the caps for Hoffmans PR, but you can put then on the F/S jack if you want to. The tip of your TSR F/S jack is for tremolo and the ring is for reverb. The 220K connects between ring and sleeve (ground) of the F/S jack. Notice the ring also connects to the reverb return jack.
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Again thanks for the replies. I put it togeather late last night on what I figured was right. It was great to have Slukey confirm. Thanks again.