Does any one know what the primary and secondary impediances of the first audio interstage transformer in a Radiola IIIa should be?

Hammond makes 7k to 16k or 10k to 90k.

Dan

Hi Dan

Use Stancor A-53, 10,000 to 90,000, which is considered 1:3 ratio. If you have an original RCA interstage transformer AES, tubesandmore.com , has a coil, P-T431, that fits inside.

Norm

: Does any one know what the primary and secondary impediances of the first audio interstage transformer in a Radiola IIIa should be?

: Hammond makes 7k to 16k or 10k to 90k.

: Dan