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The age of the unit mostly and updates here and there.
The 1076 was 50's? & 60's, the 1077 is Later 60's through 1979 at least, not sure when they stopped making them, I would assume they have? One of the 1077's I got recently has 1979 date codes on the tubes, the other 1077's I got have 1968 date codes. |
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