loctal tubes and dating - Printable Version

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loctal tubes and dating - Guest - 01-13-2008

Were loctal tubes used for a long time? I mean if you come across a device using 7F7s and 7N7s could you guess that it might be more likely to be from a certain decade?

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- 49Stude63 - 01-13-2008

Mostly you see loctals from the early to late 40's, not a lot were used in the late 30's that I can recall and they were used I think into the early 50's.

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- Ron Ramirez - 01-16-2008

Philco began wide use of loctal tubes in its 1940 models, and continued to use them for a few years after World War II.

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