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Old 18th February 2008, 06:55 PM   #1
m6tt is offline m6tt  United States
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Default Is this a good interstage transformer?

I recently picked up a giant and excessively overengineered radio from the second world war. It was a superheterodyne, but it used a choke power supply, and surprisingly, a 60-600-6000R SE output. The output transformer is a Thordarson, it lists a gap for 30ma dc, and an 8,000 ohm primary. Frequency response (as listed on the transformer's pot) is 75-15k, I'm assuming at one to three db. The model number for the transformer is T-46789. The chassis of the radio is stamped 1943.
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Old 18th February 2008, 07:26 PM   #2
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I think that this transformer has been built for reproducing the voice clearly.
I not see an equivalent type..
http://www.hammondmfg.com/5cxthor.htm
perhaps the number T-46789 is a military type.
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Old 19th February 2008, 05:05 AM   #3
m6tt is offline m6tt  United States
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it did come from a military radio, probably made before pearl harbor. I was wondering if it would work well for phase splitting in an instrument amplifier...70hz is below low E, and I imagine it'll play lower notes, albeit quieter. If so, would I hook up the 60 ohm secondaries to the next grid? or the 600s or 6000s? I understand a low impedance drives a high impedance, but I also understand the transfer gets lossy as you increase the difference.
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Old 5th January 2011, 10:14 PM   #4
DrRick is offline DrRick  United States
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So what became of your project and the radio?
I think I may have the same output transformer here if you need to make a pair. I also have some interstage xformers that I have no matches for if you still want to experment with a single channel IT xformer driven amp.
I'm interested in what became of the radio, since the xformer I have is from a military radio I took apart when I was 10 years old and I'd like to find another.

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I recently picked up a giant and excessively overengineered radio from the second world war. It was a superheterodyne, but it used a choke power supply, and surprisingly, a 60-600-6000R SE output. The output transformer is a Thordarson, it lists a gap for 30ma dc, and an 8,000 ohm primary. Frequency response (as listed on the transformer's pot) is 75-15k, I'm assuming at one to three db. The model number for the transformer is T-46789. The chassis of the radio is stamped 1943.
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