Tascam Porta 5 knob

These were from a Porta 5 

I thought these were the same as the Porta 7 but they are not, a good customer pointed out there is a difference.

put the knob on your desk with the spigot upwards and the square little marker pointing to 12 o'clock you will see that the D is the wrong way around like a mirror image the other looks like a D and has a round marker

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