Specifications
Specs
- Tube Type: 12AT7 / ECC81 / 6201 / CV4024
- Tube Socket: 9-pin
Heater
- Heater Voltage: 6.3 V (parallel) / 12.6 V (series)
- Heater Current: 0.30 A / 0.15 A
Maximum Ratings in Class A Amplification (Per Section)
- Anode Voltage: 300 V
- Grid Voltage: –50 V
- Anode Dissipation Power: 2.5 W
- Heater-to-Cathode Voltage: ±90 V
Grid Circuit Resistance
- Self Bias: 1 MΩ
- Fixed Bias: 0.25 MΩ
Interelectrode Capacitance
- Grid-to-Grid: 0.005 pF
- Plate-to-Plate: 0.4 pF
- Grid-to-Plate (per section): 1.5 pF
- Grid-to-Cathode/Heater (per section): 2.2 pF
- Plate-to-Cathode/Heater (per section): 0.5 pF
- Heater-to-Cathode (per section): 2.4 pF
- Plate-to-Cathode (per section): 0.2 pF
- Cathode-to-Heater/Grid (per section): 4.6 pF
- Plate-to-Heater/Grid (per section): 1.8 pF
Static Parameters
- Anode Voltage: 100 V / 250 V
- Anode Current: 3.7 mA / 10 mA
- Transconductance: 4 mA/V / 5.5 mA/V
- Cathode Resistor: 270 Ω / 200 Ω
- Amplification Factor: 60 / 60
- Approx. Internal Resistance: 15 kΩ / 10.9 kΩ
- Approx. Grid Voltage: –5 V / –12 V
Compatible Amps
Note: This list is not comprehensive
- Bottlehead Crack 1.1 OTL
- Bravo Ocean
- Bravo V2, V3
- Cayin HA-1a MK2
- Cayin HA-3A
- Cocktail Audio HA500H
- Elekit TU-8200R
- Manley Audio Absolute
- Original OPA-2A, OPTA-3A
- Woo Audio WA7 Fireflies (3rd Gen)
- Woo Audio WA7e Fireflies for Electrostatic Headphones
- Woo Audio WAtp (Tube Power Supply)
- xDuoo TA20 Plus
- xDuoo TA-10R
- xDuoo TA-22
- xDuoo TA-30
- xDuoo MT-603
- xDuoo MU-603
What’s included
- Pair of matched vacuum tubes OR single vacuum tube
- User handbook featuring burn-in guidelines
- Certificate of authenticity and warranty
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