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In the second 21CT-660 preamp schematic from the Broadcast News article, no values are given for the coils L1, L2, L4 and their associated capacitors.
A note says:
L1C1, L2C2, L4C3 -- RCA stock no. 75251
Any guesses as to these values? I don't have references for those part numbers. Presumably each of these was a coil with a cap wired in parallel.
Regarding L3, the note identifies it as "North Hills coil no. 120 I set at 400 mu-h," so I suppose I can use an adjustable coil around that range.
Regards,
Phil Nelson
Last edited by Phil Nelson; 07-14-2015 at 12:43 PM.
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