one amp, two guitars: one with good volume pot behavior and other with bad

[jmh]

I modded a marshall to give very good clean to crunch transitions with the stock volume knob on an Ibanez S470. unfortunately, the amp does not achieve such a transition with a gretsch 6118 that is also pretty fun to play through the marshall. The gretsch goes from nearly inaudible to full crunch over about 10% of the vol. sweep leaving 90% of the sweep doing nothing and no practical semi-clean range.

I assume something about the tone/vol stack on the gretsch is loading down the divider in the amp input stage, but not sure if it is just a volume pot value difference or whether I need to plan a more extensive mod to the gretsch wiring layout to achieve the same vol. pot functionality.

Thank you in advance for guidance on what this issue is technically and any suggestions on things I should test, plan to do, etc.

[Chuck H]

You probably need an A10 type audio taper volume pot in the Gretsch to get the same range.

[Jazz P Bass]

Did you try plugging the Gretsch into input 2 of the Marshall?

[David Schwab]

You probably need an A10 type audio taper volume pot in the Gretsch to get the same range.

I agree it's the pot's taper. Find out what kind of pot is in the Ibanez and use one with the same taper in the Gretsch.

[Mark Hammer]

Aren't some Gretsches wired "wrong way round"? That is, the input lug is the wiper.

Could that be the culprit, rather than the taper?

[David Schwab]

That's how Fender Jazz basses and Rickenbackers are wired, so that you can shut one pickup off and not have both shut off.

They don't have that sudden drop off though. One thing that seems to help Jazz basses in mixing pickups is using linear taper pots.

[Chuck H]

One thing that seems to help Jazz basses in mixing pickups is using linear taper pots.

Which can work fine for a clean sound. But once you get into clipping a linear taper jumps from off to grind much too fast. I like the A10 taper for guitars I use for distortion tones.