Interstage Audio Transformer Recommendations

[dieseljeep]

Originally Posted by polyphase

The DC resistance of a new transformer will be much less than a period original, thanks to modern materials (a good thing). The important parameter, besides current rating, is the input impedance which is 10k Ohms. The 27 specs plate resistance at 9k to 11k Ohms depending on applied voltage, so this is an excellent match

IIRC, I used one of that type transformer in my Wells Gardner chassis model ODM. It was kind of a different design, using some metal tubes and a 76 driving PP 45's, built in late 1935. Naturally, the interstage transformer was open.
I couldn't get enough volume, using the AES transformer, plus the tone control, would have little effect. The schematic is in Rider's seven. The AES transformer is a 3:1 ratio, where the W-G needs a 2:1 ratio.
A 3:1 ratio transformer might work OK in your radio. Everyone I talked to, said a 3:1 was fine.