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This tube is essentially two 6C4/EC90s in the same envelope. However, this latter type is officially described in manufacturer's data as "a special quality R.F. power amplifier or oscillator for frequencies up to 150 MHz". The 12AU7, on the other hand, is described as an "A.F. double triode".
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when mostly switched to low-current mode in switching applications, but with little attention to parameters of interest only for linear applications such as linearity of transfer characteristic, matching between the two sections,
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circuitry. Use of special-quality versions outside of the purpose they were designed for may not be optimal; for example, a version for digital computers may be designed for long life without
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Data sheets suggest an upper frequency limit of 30 kHz for the 12AU7/ECC82 and it is not described as a "special quality" device. This contrasts with the 6AB4/EC92 and
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Double triodes of the 12AU7 family have a center-tapped filament for use in either 6.3V 300mA or 12.6V 150mA heater circuits.
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vacuum tube audio as a low-noise line amplifier, driver (especially for tone stacks), and phase-inverter in vacuum tube
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Brimar application report VAD/513.4 for 12AU7/ECC82 dated
January 1952 gives a gain of -1 to -2 dB at 30 kHz
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circuits. It was widely used, in special-quality versions such as ECC82 and 5814A, in pre-semiconductor
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As of 2012 the 12AU7 continued to be manufactured in Russia, Slovakia (
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and its variants are miniature nine-pin (B9A base) medium-gain dual-
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RFT "thin-plate" ECC82 variant (left), RCA 12AU7A variant (right)
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http://www.thetubestore.com/lib/thetubestore/eh-12au7eh.pdf
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12AU7 datasheet from the RCA RC-29 Receiving Tubes Manual
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Tung-sol Data sheet for 12AU7/ECC82 dated August 1950
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Tung-sol Data sheet for 6C4/EC90 dated
December 1968
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309:"www.thetubestore.com - 12AU7 / ECC82 Tube Types"
27:Miniature medium-gain dual-triode vacuum tube
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212:is also known in Europe under its
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61:Audio amplifiers and TV receivers
214:Mullard–Philips tube designation
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374:(JJ Electronic ECC82 Datasheet)
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393:Guitar amplification tubes
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368:Reviews of 12au7 tubes.
363:Several tube datasheets
222:The tube is popular in
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142:Max dissipation Watts
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82: in (67 mm)
359:(NJ7P Tube Database)
313:www.thetubestore.com
228:push–pull amplifier
112:Coated Unipotential
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166:Socket connections
145:2.75 W per section
130:Series / Parallel
120:Series / Parallel
236:cathode poisoning
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50:Classification
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272:Tronix 12AU7
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132:150 / 300 mA
122:12.6 / 6.3 V
109:Cathode type
158:Max current
150:Max voltage
53:Dual Triode
382:Categories
295:References
241:microphony
180:References
277:See also
87:Diameter
243:, etc.
104:Cathode
94:⁄
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58:Service
199:triode
66:Height
289:12AT7
283:12AX7
249:12AT7
224:hi-fi
217:ECC82
210:12AU7
208:9A).
206:RETMA
195:12AU7
153:300 V
137:Anode
33:12AU7
18:ECC82
193:The
253:VHF
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