12AU7
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The 12AU7 (European type ECC82) is a twin medium-μ triode tube with a center-tapped filament for use in either 6.3 V / 300 mA or 12.6 V / 150 mA heater circuits, and a B9A (Noval) miniature 9-pin base.
The 5814 is a high-rel version with increased heater current.