Isosceles Level Pot Value

[williamonep]

Hi all,

I have a possibly inane question. The level pot on the isosceles is a 5k audio taper. However, I can only find a 10k audio taper. Given that it appears that the pot acts as a voltage divider in conjunction with R10 (220R) and R19(220R), would it be possible to scale the resistor values to compensate for a different value pot in place of the 5k? I attached a screenshot of the schematic so nobody needs to dig it out of their disorganized documents folder like I did. Thanks in advance!

 

[Paradox916]

One way you could address this if you didn’t want to hold out for the correct pot is to tune the pot down by soldering a resistor across lug 1 and 3 to get the proper value although this is preferable for a linear pot. This method can change the characteristics of a logarithmic depending on values of the pot and resistor.

 

[bowanderror]

The Level pot is directly linked (DC coupled) to the Treble/Bass pots & both switches, so there is a possibility that changing the overall resistance (i.e. scaling up R10/R19) of the voltage divider would change the behavior of those controls. If your pot is a 10K log pot, your best bet is to do what Paradox916 mentioned and solder a 10k resistor across lugs 1 & 3. It will change the taper somewhat, but you'll still have the same range of volume levels and you won't be messing with the other controls.