How to Pick the Right Controller
The controller has an enormous job to do--control the car, and
absorb or dissipate the heat generated by its resistance. Since all motors vary
in the amount or resistance in the armature, the same controller is available in
varying OHM ratings.
The rule of thumb is: the HOTTER the motor, the lower OHM rating
controllers work best. HO cars, 1/32 cars in sets and some older 1/32 and 1/24
car kit cars use medium to high OHM controllers. The latest motors and rewinds
use the 15 OHM rated units.
The following chart suggests what motors will operate best on what
OHM controllers. You can work from there.
15 OHMS or less:
Can type 300B, 500B, 600B, Pittman DC84, DC65-6 volt, Kemtron 6
volts, K & B Super Challenger, Atlas 6 volt, Glove SS-91, and similar "hot"
motors and rewinds.
25 OHMS or less:
Pittman DCI96B, Can type 600A, Kemtron 8-10 volts, Strombecker
Avenger, K & B Challenger, Strombecker Devastator, Pittman DC706, Ram 850,
426, Strombecker Destroyer, Hustler and similar motors including 1/32 - 1/24
scale car kits.
Over 45 OHMS:
Strombecker Scuttler, Pittman DC 65-12, Wilson 876-13, Kemtron
12-18 volt motors, all 12-18 volt motors in 1/32 & 1/24 scale ready to run
sets. The "normal" type motors for long, smooth, dependable
operation.
85 OHMS:
For HO cars of all types.