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|Part_nos= | |Part_nos= | ||
|Description=twin medium-μ triode | |Description=twin medium-μ triode | ||
|Used_in=555;122;547;C;D; | |Used_in=555;122;547;C;D;181 | ||
|Designers= | |Designers= | ||
}} with a center-tapped filament for use in either 6.3 V / 300 mA or 12.6 V / 150 mA heater circuits. | }} with a center-tapped filament for use in either 6.3 V / 300 mA or 12.6 V / 150 mA heater circuits. | ||
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* [[555]] | * [[555]] | ||
* [[122]] | * [[122]] | ||
* [[181]] | |||
* [[547]] | * [[547]] | ||
* [[D|Type D]] | * [[D|Type D]] |