MXR phase 90 pot

[DVB_master]

Hello to all.
Many effects use a rev log pot. The mxr phase 90, for example, uses a 500k rev log potentiometer.
If I can't find a rev log pot, a good replacement could be a linear one with the same resistance?
Geofex talks about pots. If I can find a 50k rev log pot, Is there any way to obtain a 500k rev log?

Thanks in advance

[Seljer]

If it doesn't bother you. You can use a regular log pot and turn around the 2 wires.
Only difference will be that it'll work in the wrong direction, but the taper will be right

[DVB_master]

So the curve of the pot resistance will be the same as a rev log pot working in reverse rotation?
0 resistance at the end of the rotation and and maximum resistance at the beginning?

The mxr phase 90 works well with a linear pot?

[Mark Hammer]

The "best" taper will depend on what part of the LFO range interests you the most.  Some folks want "fast" and many varieties of slow.  Some want fine gradations of mid-speed but never use fast OR slow.  The taper of the pot simply spreads out the range of speeds available so that some parts of the speed range have THIS much pot rotation allocated tothem, and other parts have THAT much rotation allocated to them.

A Rev-log taper will give about the same amount to each part of the overall range, but like I say, maybe the entire range doesn't interest you and only certain parts do.  There will likely be some people for whom a linear taper is perfect, and others for whom a log taper is perfect and an anti-log annoying.  Happily, the circuit will still work with any taper, and any choices/recommendation of taper over and above that are largely for anticipated user convenience.

There is absolutely no reason why you could not make that 500k pot a 250k pot with a switchable 270k series resistor.  That would split the entire range up into two - a bit like having a two-turn pot, and allow you to zero in on the speed you want with some ease.