6G6B Treble Potentiometer Question

[72Blazer]

Is there anything special about this pot?  I see it is a 350k pot but The 70k Tap has me confused.

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[sluckey]

Is there anything special about this pot?  I see it is a 350k pot but The 70k Tap has me confused.

Yes. It has a 70K tap. That means four lugs. That also makes it special.

It was used for a short time during the reign of the 6Gxx amps, then abandoned. Hard to find now so that also makes it special.

[HotBluePlates]

... I see it is a 350k pot but The 70k Tap has me confused. ...

WeberVST must have paid Alpha a long while back to re-make those pots.  AFAIK, they are one of the few (only?) places to find a 350kΩ pot tapped at 70kΩ

[72Blazer]

Thanks Sluckey and Hot Plate.

Confirm this would in fact work?

[PRR]

It is an old MONO loudness pot. When stereo arrived, these were a bit of a glut on the market. Fender found a use, good for them, but it is a historically dead-end part. And not easy to fake. Get the Weber part, while you can, IF you think this tone-network is what you want. It IS made for the Fender application.

[sluckey]

Thanks Sluckey and Hot Plate.

Confirm this would in fact work?

What do you think?

[72Blazer]

I'm gonna give it a shot.  Thanks all.

[AlNewman]

I see tapped pots quite often in radios where they combine a volume and tone circuit.

How does this example work?  Is it basically a standard fender tone stack, until the treble hits 20% rotation, then the two caps work in parallel providing a bass boost?

[pdf64]

It facilitates a treble cut http://www.guitarscience.net/tsc/brownface.htm#RIN=38k&RT=350k&RB=250k&RTap=70k&R1=100k&R2=6.8k&RL=1M&C1=250p&C2=100n&C3=100n&C4=5n&RB_pot=LogA&RT_pot=LogA

[AlNewman]

That is pretty interesting.  Must be suited for jazz or something.

[tubeswell]

It facilitates a treble cut http://www.guitarscience.net/tsc/brownface.htm#RIN=38k&RT=350k&RB=250k&RTap=70k&R1=100k&R2=6.8k&RL=1M&C1=250p&C2=100n&C3=100n&C4=5n&RB_pot=LogA&RT_pot=LogA

That’s a cool interactive plot. Thanks for posting.