The most used triode in audio systems is ECC83 or 12AX7 twin triode. Here, we will show basic specification of the vacuum tube Sylvania 12AX7. On the Picture 1 is shown the vacuum tube ECC83 from JJ electronics and the base connections.
Picture 1: ECC83 (JJ) Vacuum Tube & Bottom view (base connections)
The Sylvania Type 12AX7 is a miniature high-mu twin triode having separate cathodes. This tube is designed for service as an audio voltage amplifier or phase inverter. The center tapped heater of the 12AX7 permits operation on both 12.6 or 6.3 V.
Mechanical Data:
> Bulb: T-6 1/2;
> Base: E9-1, Small Button 9-Pin;
> Outline: 6-2;
> Basing: 9A;
> Cathode: Coated Unipotential;
> Mounting Position: Any.
Electrical Data:
> Heater Voltage Series/Parallel: 12.6/6.3 V;
> Heater Current Series/Parallel: 150/300 mA;
> Heater-Cathode Voltage - Heater negative to Cathode: 200 V max (Total DC and Peak);
> Heater-Cathode Voltage - Heater positive to Cathode: 100 V max (DC);
> Heater-Cathode Voltage - Heater positive to Cathode: 200 V max (Total DC and Peak).
Ratings:
> Plate Voltage: 300 V max;
> Plate Dissipation: 1 W max;
> Positive DC Grid Voltage: 0 V max;
> Negative DC Grid Voltage: -50 V max;
Characteristics and Typical Operation:
Class 1 Amplifier
> Plate Voltage: 250 V;
> Grid Voltage: -2 V;
> Plate Current: 1.2 mA;
> Plate Resistance: 62.5 kOhms;
> Amplification Factor: 100.
Source: Sylvania Electric Products Inc.
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