Hoffman Amplifiers Tube Amplifier Forum

Other Stuff => Effects => Topic started by: jjasilli on May 18, 2025, 12:49:44 pm

Title: Help with CTS Pot Code values / Schematic
Post by: jjasilli on May 18, 2025, 12:49:44 pm

Hi guys,


I need help to find the values of both pots on a vintage MXR Dyna Comp model 202 pedal.  The pots need replacement. 

1.  I can't find a schematic; anybody have one? 

2.  I can't decipher the pot codes:  i) 100-1230-101   1378318;  ii) 100-1230-102   1378334

Thanks!

Title: Re: Help with CTS Pot Code values / Schematic
Post by: shooter on May 18, 2025, 02:10:21 pm

so they don't ohm end-to end, or wiper to ends?

Title: Re: Help with CTS Pot Code values / Schematic
Post by: jjasilli on May 18, 2025, 03:20:56 pm

No, the pots are non-functional and won't take a meter reading.

Title: Re: Help with CTS Pot Code values / Schematic
Post by: acheld on May 18, 2025, 03:59:23 pm

Take a look at this:   https://www.electrosmash.com/mxr-dyna-comp-analysis (https://www.electrosmash.com/mxr-dyna-comp-analysis)  --  you might be able to compare your board to this model /clone, and get some ideas.  Not sayin' it will be the same, but I bet it's close.   

Title: Re: Help with CTS Pot Code values / Schematic
Post by: jjasilli on May 18, 2025, 05:52:15 pm

acheld:  I'm seeing 50K log & 500k linear pots on the schematics I can find, which don't match my model #.  But this doesn't seem to jive with pot codes, whatever they do mean.   :w2:

Title: Re: Help with CTS Pot Code values / Schematic
Post by: jjasilli on May 19, 2025, 02:37:14 pm

Jim Dunlop se t me the parts #'s and I can order them. They won't share the schematic which they consider to be proprietary.