Antique radios, Old Time Radios
5661
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Tube type: |
Vacuum Pentode RF/IF-Stage Controlling (mu) |
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Identical to |
5661
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Similar
Tubes |
Other class quality (otherwise equal):
12SK7
Heater different:
6137
; 6SK7
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First Source
(s) |
15.Nov.1947 : Electron Tube Registration List 616
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