Fender Frontman 25R Series II

[Steve A.]

Steve,

The tone stacks on these amps (at least the ones I've seen) are factored compared to the typical BF Fender TS, by a factor of 5. So the 250k pots become 50k and the caps are close to 5x the BF values. 250pf treble cap on these becomes 1000pf for example, equivalent to a 200pf on the BF.

True enough however the bass cap is 0.47uF and the mid cap is 0.22uF, both 1/10th of the BF values. Any ideas on why that is what works in their op amp tone stack?

Steve

[JoeM]

?? Not sure how you're getting that.

.47/5 = .094, close to the BF value of .1. .22/5 is.044, close BF value of .047

Divide the cap values by 5 and multiply the resistance by 5 for the factor.

[Steve A.]

?? Not sure how you're getting that.

.47/5 = .094, close to the BF value of .1. .22/5 is.044, close BF value of .047

Divide the cap values by 5 and multiply the resistance by 5 for the factor.

You're right- I was thinking of tone stacks with .047uF and .022uF caps. Not exactly BF although my favorite BF tone stack is the AB763 Super Reverb which has a .022uF mid cap...

Steve