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#3
June 8th 08, 08:21 PM
posted to rec.radio.amateur.boatanchors
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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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