VPI PLC question

I just purchased from here, I believe one of the original PLC's, i.e., the one with 2 round knobs on the front 33/45rpm, and a front toggle switch 33/45.

I have called VPI, and emailed them, and Ian, seemed to be a newer employee and wasn't familiar with the older PLC. He was to pass on my question to another person whom I haven't heard back from.

My question, I plugged my TNT JR into this thing.

On the PLC, using it toggled to the 33 RPM section, the platter spins,
On the TNT motor, if the belt is on the top part of the pulley, it will spin 33. If I put the belt on the lower wider pulley, its 45 tmp, just as it is w/o the PLC.

However when i switch the PLC switch to 45 rpm, the platter just stops at either pulley position. the pulley seems to be oscillating a bit, but not moving the belt.

I also found out, on the PLC 33 setting, I can use the 33 PLC round knob to adjust the speed of the platter dependent on the pulley position on 33 or 45rpm.
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My question is, is this normal? Why would there be a 45 switch and knob on the PLC if it doesn't do anything?

did i get a bum PLC?

thanks !