Tube-number record
ECC81/12AT7
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BrandEi-RC
ClassR.F. Double Triode
BaseNoval (B9A)
Filament6.3 V @ 300 mA
Construction
Primary TypeDual triode
Sections2
Filament / Heater
Heater NotesIndirect heating by AC or DC, serial or parallel supply.
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation2.5 W
Grid 1 Voltage-50 V
Cathode Current15 mA
H-C Voltage90 V
Audio Performance
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| — | 100 V | 3750 | 16500 | 62 | 3 mA |
| — | 170 V | 5900 | 11000 | 66 | 8.5 mA |
| — | 200 V | 6700 | 10500 | 70 | 11.5 mA |
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