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Checking around in another forum the claim is that the original OT “OT-213” is a 6.5K 8/16. My replacement is a Hammond Vibrolux type 4K 4/8/16. Seems to work fine. My question is:
Why use an additional winding for the negative feedback? ( it is nice having the extra lead but…)?
Should I assume that the original amp used the 16 ohm tap for feedback and I should also use that winding in my repaired amp?