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June 6th 08, 11:40 AM
posted to rec.radio.amateur.boatanchors
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Northern Electric R221-DX Tube Info?
Does anyone have a datasheet or tube information on a Northern
Electric R221-DX Tube? This doesn't appear in any of the usual (RCA) tube manuals. This tube appears was manufactured in Canada in the mid 1920s. Charles... |
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