PI balance pot

[heisthl]

Any chance the purpose of the 10K balance pot in the PI is not to balance the PI but to tune the PI for more overtones in the sound? The last build I just finished has more overtones than ever and a big part of it is my unbalanced PI (I'm using 91K and 110K plate resistors). Makes no sense to me but I'm afraid to change anything to test the theory.

[groovtubin]

Any chance the purpose of the 10K balance pot in the PI is not to balance the PI but to tune the PI for more overtones in the sound? The last build I just finished has more overtones than ever and a big part of it is my unbalanced PI (I'm using 91K and 110K plate resistors). Makes no sense to me but I'm afraid to change anything to test the theory.

There`a ANOTHER reason for that balance pot, that`s ALL i will say, you need ta do some homework, not being CRASS, but that`s all i will say, go study the HIFI circuits of OLD my friend...

[heisthl]

Methinks you're referring to noise rejection which is one of the 2 reasons you put the fist plate resistor at a lower value (the second being to compensate for the lower gain of the in phase section). I understand the benifits of getting the 2 sections tuned for maximum symetry but it's just a guitar amp and purposely not meant to be perfect (although no one wants hum or noise or anything else that's non musical). I'm just trying to understand why a PI that's not "tuned" might have more overtones.

[groovtubin]

Methinks you're referring to noise rejection which is one of the 2 reasons you put the fist plate resistor at a lower value (the second being to compensate for the lower gain of the in phase section). I understand the benifits of getting the 2 sections tuned for maximum symetry but it's just a guitar amp and purposely not meant to be perfect (although no one wants hum or noise or anything else that's non musical). I'm just trying to understand why a PI that's not "tuned" might have more overtones.

Thats simple, amps of old like fender were NEVER BALANCED, one side( OT) gets more FREQUENCIES than the other, its NOT PERFECT, you know what the OLD guys called THAT, DISTORTION,
Distortion=odd harmonics, of just @ every kind=more interesting notes you hear come out of speaker...HTH`s..