Thread: Northern Electric R221-DX Tube Info?
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Old June 6th 08, 12:40 PM posted to rec.radio.amateur.boatanchors
VA3NGC VA3NGC is offline
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Default 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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