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Socket-Saver Noval

Description

Type: Noval Socket Saver
Bakelit
for Tube Type: 12AX7, 12AT7, 12AU7, EL84,
EZ81, EL844 etc.

Manufacturer

Herstellerinformationen | Manufacturer Information

Tube-Town GmbH
Rumbergring 37
D-66969 Lemberg
eMail: info@tube-town.de

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Electro-Harmonix has released a low noise, low microphonic version of the 12AX7 that meets all specifications required for the tube to be designated 7025. The original 7025 tube was a 12AX7 that was tested and selected for the lowest noise and microphonics for use in the critical first preamp stages of amplifiers where noise and microphonics could be an issue. In order to ensure that the 7025 specification is consistently met, Electro-Harmonix has redesigned the structure of the 12AX7 and has implemented construction techniques to ensure the absolute lowest noise and microphonics possible. In all samples tested, noise and microphonics could not be detected.

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TT 12AU7 / ECC82

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Features:

Detailed sound
Ideal for both low and high gain amplifiers

Tip:
Often, 12AU7 and 12AT7 types are used instead of 12AX7 tubes to either reduce the overall power of the amplifier or to just reduce the overloading of the preamp. In comparison to a 12AX7, the 12AU7 brings about a very large sonic difference, typically much greater than switching from 12AX7 to 5751 or 12AT7.

When using a 12AU7 in a driver stage normally designed for 12AX7, the overall power of the power stage is usually reduced. The extent of this difference depends on the amplifier or circuit. For example, a Marshall amplifier with a 12AX7 in the PI stage set at volume 5 will then reach the same volume level with a 12AU7 at volume 6 (perceived volume, not measured).

Electrical Properties

Heater Voltage (Uf): 6.3V or 12.6V
Heater Current (If): 300mA at 6.3V, 150mA at 12.6V
Anode Voltage (Ua): Maximum 300V
Grid Voltage (Ug1): -8.5V (typical)
Anode Current (Ia): 10.5mA (typical)
Anode Dissipation: Maximum 2.75W per triode
Anode Resistance (ra): 7.7kΩ
Amplification Factor (μ): 17
Transconductance (S): 2.2mA/V
Input Capacitance (Cin): 1.6pF
Output Capacitance (Cout): 1.6pF

Mechanical Properties

Socket: B9A (Noval)
Number of Pins: 9

Pin Configuration

1 Anode (Triode 1)
2 Grid (Triode 1)
3 Cathode (Triode 1)
4 Heater (f)
5 Heater (f)
6 Anode (Triode 2)
7 Grid (Triode 2)
8 Cathode (Triode 2)
9 Center Heater (f)

Application Notes

Heater Operation: The tube can be operated at 6.3V or 12.6V, depending on the circuit design.
Grid Resistors: It is recommended to use grid resistors of at least 1MΩ to ensure stable operation.
Coupling Capacitors: Capacitors with low capacitance (typically 0.1µF) are recommended to minimize high-frequency interference.

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