Got some Newcomb input trannies. Now what should I do?

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Got some Newcomb input trannies. Now what should I do?

Post by Rodgre » Mon Jan 10, 2011 10:36 pm

I just inherited some Newcomb TR-100 input transformers. They have 125/500 Ohm primaries and nothing listed on secondary other than "Sec to grid". Would these make good mic input transformers for a preamp? Any thoughts on what sort of preamp design I should pair them with?


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Post by winky dinglehoffer » Tue Jan 11, 2011 7:41 am

"sec. to grid" would suggest a high impedance on the secondary--probably between 50K & 100K. Should work well for (some) tube designs & possibly for something like an API-style mic pre (1:10 transformer, if I'm remembering right.) If you can find a schematic from an old Newcomb mixer, you might get some clues from there. Sorry I don't have more info to offer.

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