Manufactured to military standards by Allen Bradley in the 1970's these are best quality Type J vintage hot molded carbon composite bush mounting potentiometers, 100 Ohm linear 10% and high 2.25 Watt rated, to 500Vdc.
AB full part number is JA1N200P101UA
Standard AB carbon pots were used in many high end audio applications, these mil-spec versions are even better !
We took one to pieces to see how they are constructed, and they are superb. A wide carbon track laid down on a really thick molded paxolin body. The wiper is a 3mm carbon block in a beryllium copper mount which ensures low noise and long life. Connections are heavy solder eye tags.
Body dimensions are 28mm diameter x 15mm deep, plus the shaft which has a 8mm diameter threaded through panel part which is 10mm in length, plus the long stainless steel control spindle which is 40mm long and the standard 6.3mm (1/4") in diameter.
Electrical rotation is 280 degrees and mechanical is 316.
These vintage pots are in perfect condition, in their original boxes and supplied with lock nut.