Antique radios, Old Time Radios

6687

Country:	United States of America (USA)		Brand:	Common type USA
			Tube type:	HEPTODE

Tube ID = 20446


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Identical to	6687 = E91H
Similar Tubes	Normally replaceable-slightly different: 1680; 2032; 5915; 6BY6; EH900S; EH960
First Source (s)	23.Jul.1956 : Electron Tube Registration List
Predecessor Tubes	6BY6 5915 EH900S

Was used by	Technology / Measurement
Filament	Vf 6.3 Volts / If: 0.27 Ampere / -: Indirect / -: Parallel, (AC/DC) /
Description	Designed as logic switching tube: both control grids at 0 V = tube conducts, control grid #1 OR control grid #3 at negative voltage: tube blocked. _ [JR] Text in other languages (may differ)
Tube prices	0 Tube prices (visible for members only)

Telefunken Taschenbuch 1971
Anonymous 15 Collector

No further Information for

6687

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