Explanation of AB Type J part numbers, to aid in identification of surplus pots:

Example: JA1N200P504AA

JA = Single section type J

(JS = single with switch, JD = dual, JB = dual with switch, JE = triple)

1 = Standard locating lug location

Facing the shaft, with solder lugs at bottom:

1 = Lug at 9 o'clock

2 = Lugs at 9 and 3 o'clock

3 = Lug at 3 o'clock

4 = No lugs

N = Plain bushing, 0.375" long

(Other options are for different bushing lengths, locking bushings, watertight bushings, etc.)

200 = Shaft length in inches (2) and 64ths (00)

056 would be 56/64" (7/8")

P = Plain round shaft ending

(S = slotted, F = flatted)

504 = Resistance 500,000 ohms (500k)

(The 4 indicates the number of zeros following the first two numbers. 254 is 250k; 105 is 1 meg.)

AA = The first A indicates taper and tolerance:

A = Clockwise modified logarithmic, +/-10%

R = Clockwise modified logarithmic, +/-20%

B = CounterCW modified logarithmic, +/-10%

T = CounterCW modified logarithmic, +/-20%

D = Clockwise exact logarithmic, +/-10%

K = Clockwise exact logarithmic, +/-20%

U, M, S, Y, C, and F are linear tapers

The last A just indicates what mounting hardware comes with the pot.

A = one mounting nut and one lockwasher

This info is from the 1981 AB catalog.

New old stock from SOHIO, BP Alaska, Exploration Alaska

Some Items may have packaging with cosmetic issues due to storage conditions, but the actual item has been checked to be in perfect condition unless otherwise specified. 

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