[Al Skierkiewicz]

Eugene,
The noise you were seeing is the brush noise produced by the motor. Since the brush repetition rate is is much slower than the rep rate for the Jaguar, it was not as evident as the with the Victor. The noise should be the same when viewed under the same settings on the scope for both controllers. The greater noise is produced in the motors when the brush leaves a commutator segment and the inductance of the motor winding gives and "inductive kick" that produces an arc. Just like an arc transmitter, this arc produces wideband noise which you are seeing on the scope.