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5639, NATIONAL, CK5639, CV2662
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5639, NATIONAL, CK5639, CV2662

Only 5 left!

5639,  NATIONAL, CK5639, CV2662 

Amperex 6939 high gain twin tetrode for use as a Class C amplifier, oscillator, frequency multiplier and modulator. 12.6v filament.

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