Sub 37 buy used - serial number Keybed and filter

[SynthWizard]

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Sub 37 buy used - serial number Keybed and filter

So I might buy an used Sub 37. I know they have changed the filter knob at some point and also the keybed if I understood that right. People are writing that you could somehow check if you have the serial number, but I can’t find any information about which serial numbers would have the old filter-knob and when the new keybed was introduced.

Can someone help / or knows how to check this?

submitted by /u/lqlwle
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