What tone pot for T1 RVT amp

[johnnieboy]

I need to replace the treble tone pot in my Guild amp. It's a 3 meg pot, anybody know for certain if they're linear or log? Thanks.

 

[Rocky]

Based on the circuit it's in, I'd guess linear, but that's not necessarily how ears work.

Be aware that most 3 meg pots sold for guitar amps are actually reverse-analog (used in Fender tremolo circuits).

 

[Default]

From vacation googling, I'd say that these are audio/logarithmic taper pots. I would look for the proper pot at Mouser, or the like, or you could try the Fender pot and swap the two outer connections.

 

[Rocky]

Alternatively, it looks like the bass pot is also a 3 meg of unspecified taper. Seeing as neither is specified, they're likely the same. Check the resistance on the bass pot at 50%, and that should tell you a lot.

 

[Default]

Remember, this is a boost-cut, not a simple cut like Fender. Flat response is at 12 o'clock.

 

[Rocky]

Remember, this is a boost-cut, not a simple cut like Fender. Flat response is at 12 o'clock.

Right, they're both balance pots, sorta Big Muff style. It's why I figured they're linear. 50% on either side at 50% rotation.

 

[Default]

When I did my quick Google from San Juan, the Bax stack articles were specifying audio taper, but best to check anyway.

 

[johnnieboy]

Turns out the pot is fine, one of the pot terminals had bent up just enough to touch an adjacent terminal causing the problem.

 

[Default]

Very cool!