TEAC R- H500 SILVER KNOB If you see the photos

If you see the photos you will see its actually much better than others advertised at much higher price

quite rare

I took these off and sent my heads away for a relap but they have to be sent together as they are carefully set with washers to the correct height to get the tape to travel across the heads correctly so after factory set up they should not need ever taking off

I think this is a universal unit just you need change the sensor vane for left and right

simple logic board

TEAC R- H500 SILVER KNOB If you see the photosSimple knob used on the Teac Hi Fi stack system They used a few sizes on the H500 stack this one is 12 . 23mm wide