The transformer was used in a Columbia 5 tube TRF receiver, also known as a Radynola 5 tube radio circa ~1926.
The original had an open secondary. This replacement transformer seems to work just fine.

I used this to replace the push-pull audio input transformer on my Philco Model 20 radio from 1931. The old transformer had an open primary winding. This replacement works extremely well.

Very pleased!! I jave installed MANY of these transformers in many makes and models with great success! Very pleased!!

I used this transformer to replace an interstage transformer in an Atwater Kent model 20C radio with an open primary winding. After removing the old transformer from it`s can, I striped the outer mounting bracket off the new transformer, and hot melt glued it into the original transformer can. It works great! Thank You!

Excellent solution for audio interstage transformers on a Bosch Model 35. Fits nicely in original housing. Great product.

Great product at a great price

Great audio interstage transformer for repairing vintage Atwater Kent Radios. The tapped secondary is very handy when a reduced impedance is required for the final stage.

Worked good in my Elmac AF-67

Perfect replacement for those bad audios in your 1920’s radios.

I used this to replace a grid drive transformer for a push pull output stage on my Majestic model 90B it worked very well.