Filmosound dual pot

[atmars]

http://s294.photobucket.com/albums/m...mosoundL-2.jpg

I am trying to convert this filmosound amp to a guitar amp with limited abilities, so I'd appreciate any advice.

My most pressing issue is the volume pot is a dual pot that is seen better days. It's marked 200m/25m on the schematic but I believe it's really 200k/25k. I'd like to replace this pot but I don't think this type of pot is available. One half the pot feeds the grid of the preamp tube the smaller half feeds a third 25L6 (lower left of schematic) that I believe is not needed in the circuit. My understanding is that removing the circuitry for this tube is not possible without major modifications to the rest of the circuit.

My question is: Is there a way I can leave the third 25L6 in the circuit but not have the grid attached to a volume pot so it is doing it job in the circuit but just not "hooked up". Maybe a resistor on the grid? What value? Attached to what? Somme other idea? If this could be accomplished it would allow me to replace the volume pot with a standard pot.

Thanks for any input.

[dnsey]

It's marked 200m/25m on the schematic but I believe it's really 200k/25k. I'd like to replace this pot but I don't think this type of pot is available. One half the pot feeds the grid of the preamp tube the smaller half feeds a third 25L6 (lower left of schematic)

You could buy a dual gang pot of each value and exchange the tracks on one section.

[atmars]

You mean physically take them apart and frankenstein them together?

[dnsey]

Yes, quite easy with most pots.