JJ 5751

With a soft and detailed sound, as well as sufficient headroom, the TT 12AU7/ECC82 enhances the sound characteristics of any amplifier, whether it's for guitar, bass, or high-end. These tubes deliver a dynamic range, captivating listeners and musician with uncompromising clean sounds and rich overdrive.

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.

Knob Fender Style Vintage

• Material: Phenolic
• Shaft Size: 6 - 6,3 mm
• Size: 20,3 x 11,8 mm
• Mounting: Set-Screw with Bras insert

• Wiring harness for internal speaker connection
• Number of speakers: 1
• Type: Mono
• Wire: 2 x 1,5 mm² red - black
• Jack socket / speaker crimps
• Length: ca. 55 cm

TT Selection: V1 - Low Noise
This tube is selected for sensitive input stages (V1)

This tube is recommend to tame the gain of an amp and make it sound "sweeter". The 5751 has only a gain of 70 instead of 100 like the typical 12AX7/ECC83 tube type and can be used as a drop in replacement for 12AX7 / ECC83 tubes.

Files:

• Datasheet

DOUBLE ANODE RECTIFYING TUBE

EZ81 is 6CA4 Noval base rectifier diode for guitar or HiFi ampliers.

Files:

• Datasheet

Electrolytic Capacitor

• Capacitance: 30 µF
• Voltage Rating: 500 V
• Tolerance: -10 % / +30 %
• Operating Temperature Range: - 25°C / + 70 °C
• Dimensions: Ø 25 mm x 42 mm
• Termination Style: axial leads

• Type: Multisection Capacitor
• Capacitance: 50 + 50 µF
• Voltage Rating: 500 V
• Tolerance: - 10% / +30 %
• Operating Temperature Range: - 40°C / + 85 °C
• Dimensions: Ø 35 mm x 50 mm
• Termination Style: radial, solder lugs

• Type: Metalized Polyester Film Capacitors
• Voltage Rating: 250 V
• Tolerance: +/- 10%
• Operating Temperature Range: - 40°C / + 85 °C
• Termination Style: axial