JJ EL34 Version II - PAIR

Silico-Wire with lug, assembled
Can be used for ground connection, earth protection etc.
Diameter Wire: 0,75 mm²
Length Wire: 0,5 m
Lug crimped

• Colors: red, blue, yellow, black
• Packing: 4 x 2 m
• Insulation: Silicon
• Operation Voltage Uo/U: 300 / 300 V AC
• Test Voltage: 2000 V
• Operating temperatures: –50 bis +180 °C
• Cross-Section: 0,5 mm²
• Outer Diameter: 2,1 mm
• Stranded wire structure: 16 x 0,20 mm, tinned copper

Wire Silicon, SiAF

• Insulation: Silicon
• Operation Voltage: 500 V
• Test Voltage: 2000 V
• Operating temperatures: –50 bis +180 °C
• Packing: 5 m
• Cross-Section: 0,75 mm²
• Outer Diameter: 2,25 mm
• Stranded wire structure: 24 x 0,20 mm, tinned copper

Wire Silicon, SiAF

• Insulation: Silicon
• Operation Voltage: 500 V
• Test Voltage: 2000 V
• Operating temperatures: –50 bis +180 °C
• Packing: 5 m
• Cross-Section: 0,75 mm²
• Outer Diameter: 2,25 mm
• Stranded wire structure: 24 x 0,20 mm, tinned copper

Wire Silicon, SiAF

• Insulation: Silicon
• Operation Voltage: 500 V
• Test Voltage: 2000 V
• Operating temperatures: –50 bis +180 °C
• Packing: 5 m
• Cross-Section: 0,75 mm²
• Outer Diameter: 2,25 mm
• Stranded wire structure: 24 x 0,20 mm, tinned copper

Wire Silicon, SiAF

• Insulation: Silicon
• Operation Voltage: 500 V
• Test Voltage: 2000 V
• Operating temperatures: –50 bis +180 °C
• Packing: 5 m
• Cross-Section: 0,75 mm²
• Outer Diameter: 2,25 mm
• Stranded wire structure: 24 x 0,20 mm, tinned copper

Bias probe for indirect measurement of quiescent bias current of a tube. The adapter is inserted between the tube and the socket and gets connected to a standard voltmeter (not included). Pay attention to the quality of the measuring device and sufficiently charged batteries!

The quiescent current is measured indirectly via a precision resistor integrated in the adapter. The advantages of this measuring method are harmless voltages at the measuring plugs, which are in the mV range, as well as short ways for the current, since it does not need to be fed through the measuring device (common practice with many measuring adapters of Far Eastern production). As a result, there is no risk of oscillations of the amplifier which can lead to possible damage of the tubes or the amplifier itself.

Note: This adapter cannot be used when additional tube brackets are installed. These must be removed before using the measurement adapter and reattached after the measurement is complete.

Procedure for the measurement

Determine the resistance of the adapter, including the measuring leads. To do this, connect the adapter to the meter, but do not plug it between the tubes and the amplifier, yet. Select the measuring range “Ohm” on the meter and note the measured value, e.g. 1,1 ohms.

For the final measurement insert the adapter between the tube and the currentless amplifier and connect it to the meter, select the measuring range mV and switch on the amplifier. When the amplifier has reached a stable operating condition, read the value in mV from the meter and calculate the quiescent current based on Ohm's law.

Example:
measured voltage = 47 mV, resistance of the adapter = 1,1 ohms.
Formula (I = U / R) or in this case:
bias current (in A) = measured value (voltage in V) / measured value (resistance in ohm)
0.047V / 1.1 ohms = 0.042A or 42mA respectively

For the calculation of the correct bias current as well as further information on the bias measurement, please refer to further documents or the bias setting instructions in the info area, as well as the manual of the amplifier itself.

This measuring adapter is suitable for all EL34, 6L6, 6550, KT88, 6V6, 6CA7 and other tubes with the same pin layout.

Attention high Voltage! Measurements and work on tube amplifiers should only be carried out by qualified persons.

TT Selection: Balanced
Both systems with balanced gain

The 12AX7EH provides high gain with ultra low noise and detailed, musical tone that rivals the most desirable NOS types.

Files:

• Datasheet

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

Tube-Town E83CC Preamp-Tube

High-quality 12AX7 / ECC83 / 7025 preamp tube with low background noise and reduced feedback tendency due to short anode plates, as well as a powerful bass and a dense sound. Very suitable for input stages with high amplification or amplifiers with generally high gain.
Dropin replacement for all 12AX7, ECC83, 7025, and E83CC tubes.

Electrical Characteristics

• 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 voltages (Ug1): -2V (typical)
• Grid voltages: -50V to 0V
• Anode current (Ia): 1.2mA (typical)
• Anode power dissipation: Maximum 1W per triode
• Anode resistance (ra): 62.5kΩ
• Amplification factor (μ): 100
• Transconductance (S): 1.6mA/V
• Input capacitance (Cin): 1.6pF
• Output capacitance (Cout): 1.6pF

Mechanical Characteristics

• 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 with 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 functionality.
• Coupling capacitors: Capacitors with low capacitance (typically 0.1µF) are recommended to minimize high-frequency interference.

4 tubes, matched as quad

5881 Tube by JJ

Files:

• Datasheet

Sweet and warm sounding preamp tube with high gain. We recommend this tube for guitar/bass amps.

Files:

• Datasheet