the legendary Joe Gagan found this info on a vintage radio site. I thought it was definitely worth reposting. thanks, Joe!
found this info at an old radio parts site.
this info may apply to pots made between 1930s through 60s, possibly into 70s and 80s. use the following at your own risk:
CLAROSTAT TAPERS:
Z = audio taper
S = linear taper
V = c bias taper (right hand taper)
T = ant. & c bias taper
U = left hand ant. & c bias taper
W = left hand taper
L = left hand taper
N = left hand taper (screen grid, regen, phono pickup)
Y = audio shunt & AVC when taper desired
Tapers: Z = Audio Taper, S = Linear Taper
----------------------------------------------
IRC POTS: I have some "B" elements (like "Q")
than can be used in custom pots - inquire
They can also be used to make gang controls
but I have no time or knowledge to make any
complicated controls
IRC TAPERS:
13 = audio
11 = linear
14 = reverse taper
17 = special or tone audio
18 = special or tone audio
19 = special or tone audio
Most of the IRC pots with taps are for
use in volume and tone audio circuits
Example: Q13-137 is a audio taper pot
Example: Q11-137 is a linear taper pot.
---------------------------------------------
Allen Bradley (Ohmite) tapers:
U = linear
J = taper (such as audio)
A = unknown taper
---------------------------------------------
CENTRALAB / CRL tapers:
6 = audio taper
1 = linear
2 = right hand taper
3 = taper both ends
4 = short taper, left end
C1 = linear taper
C2 = audio taper
C3 = reverse audio taper
C4 = audio taper - modified log 20% center,left hand
C5 = reverse audio - modified log 20% center, right hand
C6 = semi linear taper modified log 40%, volume, ant. shunt, c bias
C7 = semi linear taper
C11 to C17 = volume with tone comp.
---------------------------------------------
MALLORY TAPERS:
#1 = audio taper
#2 = logrithmic right hand taper
#3 = left/right taper (ant., Shunt & Bias Circuits)
#4 = linear taper
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