Well, the serial number gave it away..
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15 years ago
What is it? Set 261
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15 years ago
Rob I dont see my post so I apologize if I clicked the wrong button and sent it to your inbox.
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That's ok, I've done that a few times myself.
Rob
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15 years ago
The aluminum ones had black anodized inserts for use as heat sinks. Glass envelope got too hot, otherwise. Was found on lots of military gear from the 1950's era.
Paul, KD7HB