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antiquekid3 11th June 2010 08:36 PM

Random Part Identification
Hey guys,

I found a bunch of random parts that I would like some help identifying.

The grey iron came out of some dynamotor-powered military radio set, or something like that. I am especially interested in using the two big Utah output transformers, which seem to be identical (although one has a number consecutively higher than the other). When I got my ohmmeter after it, they tested the same. However, I couldn't seem to locate any info on them.

I also couldn't find any info on the Thordarson iron. It's OLD! I'm not sure from what decade, but my guess would be the 1930s or 1940s. One has a model number of "5603" and the other "5516."

The clue what they are. I couldn't seem to find any info on them either. I tested them on my transistor checker, and they didn't seem to do too much, but they did more on the NPN setting than the PNP. I connected it just like most TO-3 packages are: collector=can, base=top-left pin, emitter=top-right.

The MOSFETs I HAVE identified. However, I would like to know if they would be a good choice for a power amplifier. These MOSFETs are MTM55N10s from Motorola.



Enzo 12th June 2010 05:10 AM

Thordarson T5603 also called T56R03
85 watt power transformer
700VCT @ 105ma
5V @ 2A
1.5V/2.5V @ several amps (Hey, back them low voltage heaters were common.)

Thordarson T5516 aka T55A16
Audio interstage
mic/line to single or push-pull grids
50/200 ohms to 100,000 ohms CT.

That is all I can help with.

The loose transistors look to have house numbers on them, hard to say what they were at birth. They may not even be transistors, could be thyristors of some sort or voltage regulators or who knows.

ANy chance you can find the model number of that military dynamotor whatsis?

antiquekid3 12th June 2010 05:21 AM

Thanks! That's a big help indeed!

The dynamotor was a GE if memory serves. Someone was throwing out a bunch of it (he felt our radio club didn't want any of it), but someone else got the dynamotor. It was a 24V unit, I believe. Sorry I can't be of more help!


star882 12th June 2010 05:36 AM

The TO3 package MOSFETs probably have too much parasitic inductance and capacitance to work well for an amplifier. (A subwoofer amplifier with a carrier frequency just above 20kHz could be made to work.) Should work great for power supply circuits, however.

Enzo 12th June 2010 10:34 PM

Darn, I was hoping if we knew those gray parts were from an ABC123 radio or whatever, we could look up the wschematic and learn about the parts.

antiquekid3 13th June 2010 12:15 AM

I might can find out. I'll check around and see what I find. I remember it had a rough black finish on it. It wasn't quite wrinkle finish, but close I guess. It also was copper colored on the inside. It had maybe 6 to 8 tubes in it. It was meant to be in a rack considering it was exposed and had a handle on it (so you could pull it out). Definitely US military, though, no questions about it!


indianajo 13th June 2010 12:57 AM

military surplus
Good luck on the military stuff. I worked in the "stupid questions" department of the 1st Inf Div USAR for 3 years, (MATO). Occasionally people would drag in electronics they found in their container and ask us what it was and what it was used for. A lot of times we would have to take the numbers and call Signal Command in New Jersey. This was for current inventory stuff. A lot of times Signal Command would have us call missile command somewhere else for the stuff they didn't know what it was.

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