Radio Receptor Co. NY USA Audio ATX Transformers FS
 

I have about 5 of these "amplifying Transformers". Type Audio ATX. 4
connections on the top of the round black
enclosure. Positive B Grid Plate & reg fil or bias. Not sure what
these might have been used on. I got them in an
estate sale. If they are of any use to anyone..I can send a digital
pic or two and I would sell.
Earl