12AU7

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RCA 12AU7A (right) and RFT "thin-plate" ECC82 variant (left)
RCA 12AU7A (right) and RFT "thin-plate" ECC82 variant (left)

12AU7 is a miniature 9-pin medium-gain dual triode vacuum tube. It belongs to a large family of dual triode vacuum tubes with share the same pinout (EIA 9A) 12AU7 is also known in Europe under its Mullard-Philips tube designation ECC82.

The tube is popular in hi-fi vacuum tube audio as a low noise line amplifier, driver and phase-inverter in vacuum tube Push-pull amplifier circuits.

The tube has a center tapped filament so it can be used in either 6.3V 300ma or 12.6V 150ma heater circuits. Image:EIA-9A.png


Current production of 12AU7 takes place in Russia (Electro-Harmonix brand), Slovakia, Serbia and China.


Also see 12AX7, 12AT7.


[edit] References

[1] - 12AU7 datasheet from the RCA RC-29 Receiving Tubes Manual (NJ7P Tube Database)

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