Old Bendix Radio Transformer

I have a bad transformer on my Bendix 526 radio. I want to keep the radio as original as possible but it’s old.The Power output for the speaker comes off a 50L6GT. The voice coil impedence appears to be 3.2.
The original transformer measures 1.5 wide x 1.25 tall x 1.25 thick. I don’t know if this old transformer has a comparable replacement, but I might get lucky if there’s brain out there with a deep knowledge base.

yes, and their parts list does not help much either. Click here

I considered that knowing the output of the tube and the fact that the 4" speaker is 3.2 ohm, that those specs may reap a match.

I glad just to find the tubes still avialable like the 50L6gt Click Here

I have boxes of them, lol I just need the transformer.

Hello christophermerry,

Have you repaired your Bendix 526 radio?

That’s a nice looking “All American Five” set with octal tubes. If it’s in good shape, it’s well worth the repair. If it’s not in good shape, it’s still worth the effort as you can learn more about this 1940’s technology without the added stress of damaging a quality set.

Like many radios from that era, the output transformer is physically mounted on the speaker itself. It is challenging to locate a suitable output transformer. Not so much from an electrical availability standpoint, but instead from physical size and mounting options.

Please consider transformers from Hammond Manufacturing. Transformers such as the 125ASE may provide acceptable performance. It’s a generic part that can substitute for a wide range of single ended amplifiers such as the one in your radio. However, you may need to get creative with the physical mounting.

Please let us know if you were able to repair the set. Pictures would be most welcome.

Best Wishes,


P.S. If you haven’t already done so, may I recommend you replace the capacitors circled in this schematic. A short circuit in either of these capacitors will generally lead to destruction of the output transformer. Actually, it may be better to replace all of the capacitors as they were never designed to last for 77 years.

1 Like