general-el: Need Help with Replacement Part

ID: 543194
? general-el: Need Help with Replacement Part 
17.Aug.20 03:23
41

Robert Stetz (USA)
Articles: 9
Count of Thanks: 3
Robert Stetz

 

Hello Antique Radio Experts

 

I am working on bringing this 1934 GE M-51 Back to life.

I have at this point cleaned the chassis and replaced deteriorated cloth wiring.

All the paper and electrolytic capacitors have also been replaced. 

When I fired this old girl up she was completely soundless.  Power supplies looked good.

After a bit more investigation I found the audio output matching transformer has an open primary winding.   The speaker voice coil is good, along with the field coil.   If I could find an output transformer with 450 ohm primary and 4 ohm secondary I am sure I can bring this old girl back to life. 

Suggestion on where to find a transformer or other possible work around would be helpful.

 

Thanks for the Help

Bobstetz@msn.com

 

Bob

 

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 2
general-el: Need Help with Replacement Part 
17.Aug.20 11:49
41 from 921

Daniel Consales (D)
Articles: 224
Count of Thanks: 4
Daniel Consales

Hello Mr. Stetz,

I just want to say that the "450" ohms are the dc resistance, According to the tube datasheet of the 41 tube you'll need an SE output transformer whith a primary impedance around 7k.
If originality is not mandatory that should not be a big deal.

If you search on google "output transformer 7k" there are many hints.

Kind regards,

D. Consales

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