tube baxandall tone control potentiometer resistance value

[cl1238]

For a tube Baxandall tone control circuit where the design show 500K pot, what effect would it have if the 100K pot is used.
Thanks.

 

[JonSnell Electronic]

You will get the wrong frequency band adjustment.

 

[artosalo]

You will get the wrong frequency band adjustment.

...which means that you should adjust the capacitors of the circuit to get the proper response.

 

[JonSnell Electronic]

...which means that you should adjust the capacitors of the circuit to get the proper response.

Which will get very messy.

 

[Bone]

Load the tone stack calculator from here http://www.duncanamps.com/software.html a Passive Baxandall is called a Jones network. you can substitute different values to check them out.
a passive tone network should be made with A law Audio pots. Beware the passive tone controls on eBay, they have linear pots and don't track properly!

 

[artosalo]

Which will get very messy.

To be more clear:

Baxandall tone controll circuit can be built as well with 100 k potentiometers as with 500 k potentiometers.
Ofcourse the values of other components should be recalculted accordingly to get proper frequency response and operation.

An example:

 

[Junm]

hi ARTO....you use 6F12P Triode section only...how can we use the pentode section on this schematics?

 

[artosalo]

Do you mean instead of triode section ?
Or as a driver for triode-baxandall section ?

Below is a 6F12P / 6N6P preamp with Baxandall. Pentode is connected as a triode, however.