Northern Electric R221-DX Tube Info?

June 8th 08, 09:21 PM posted to rec.radio.amateur.boatanchors

VA3NGC

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First recorded activity by RadioBanter: Apr 2008

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Northern Electric R221-DX Tube Info?

Thanks. That is what I thought as they were found in an AK20 that had
one 201a in it along with these R221's. Physically the R221's are
different looking than the 01a's as they have a double filament like a
071a has. The filaments also burn much redder than the 01a filaments.

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