2026 NEW Shuguang Tube 12AT7(ECC81)Amplifier HIFI Audio Vacuum Tubes

Heating by a hot wire

Uh…………………………………………………..6.3 (in parallel)  12.6 (in series)  V

Ih…………………………………………………… 0.30  0.15  A

Limit values for Class A1 amplification (per side)

Anode voltage…………………………………………….. 300  V

Gate voltage…………………………………………….. -50  V

Anode power dissipation………………………………………. 2.5  W

Voltage between the hot wire and the cathode (pk)………………………….±90  V

Gate resistance

Self-bias voltage…………………………………………………. 1  MΩ

Fixed bias voltage…………………………………………….. 0.25  MΩ

Inter-electrode capacitance

Gate-gate……………………………………………..0.005  PF

Anode-anode……………………………………………..0.4  PF

Gate-anode (per side)……………………………….1.5  PF

Gate-cathode, hot wire (per side)……………………2.2  PF

Anode-cathode, hot wire (per side)……………………0.5  PF

Hot wire-cathode (per side)………………………………2.4  PF

Anode-cathode (per side)……………………………….0.2  PF

Cathode-hot wire, gate (per side)……………………4.6  PF

Anode-hot wire, gate (per side)……………………1.8  PF

Static parameters

Ua ……………………………………………………..100  250  V

Ia……………………………………………………….. 3.7  10  mA

Gm…………………………………………………….. 4  5.5  mA/V

Rk……………………………………………………..270  200  Ω

μ………………………………………………………60  60

ri(approx) ……………………………………………15  10.9  KΩ

Ug(approx) …………………………………………. -5  -12  V

(When Ia=10μA)