04-28-2018, 03:48 AM
They had something about doing that in an old issue of the Antique Radio Classified, I didn't really pay too much attention as I thought it was rather impractical seeing that you can use a low voltage transformer to do much the same thing, even one removed from a "Wall Wart" power supply. However one of those line output jobs might work as an audio coupling transformer in some instances, depending on the ratios available.
Regards
Arran
Regards
Arran