Tube-Town GmbH

Size of sample ca: 9 x 9 cm
Actual shades may vary.

Material:
80% PVC Film
20% Poly-Cotton Fibre

REACH compliant

Width approx. 135 cm
Price per running meter
Color reproduction depends on the computer monitor and may vary
Supplied as one continuous piece when ordering more than 1 m

Material:

• 80% PVC film
• 20% polyester-cotton fabric
• REACH compliant

Please note!
When ordering more than 1 m of Tolex and selecting Deutsche Post / DHL Paket or Express as the shipping method, the Tolex will be cut to a width of approx. 115 cm. This is due to the maximum permitted parcel length of 120 cm for these shipping services.
To receive the full roll width, GLS or ExprexxXL must be selected as the shipping method.

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.

Bracket for capacitors

• 2-piece, with screws
• d = 40 mm

Size of sample ca: 9 x 9 cm
Actual shades may vary.

Material:
80% PVC Film
20% Poly-Cotton Fibre

REACH compliant

Piece of Tolex with a minimum size of 100 x 40 cm
Actual shades may vary

Material:
80% PVC Film
20% Poly-Cotton Fibre

REACH compliant

• Double diode, rectifier tube
• Mixed manufacturers
• NOS

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

• Insulation: Silicon
• Operation Voltage: 300 V AC / 500 V DC
• Test Voltage: 2000 V
• Operating temperatures:  –50 bis +180 °C
• Packing: 5 m
• Cross-Section: 1,5 mm²
• Outer Diameter: 2,8 mm
• Stranded wire structure: 30 x 0,25 mm tinned copper

• Insulation: Silicon
• Operation Voltage: 300 V AC / 500 V DC
• Test Voltage: 2000 V
• Operating temperatures:  –50 bis +180 °C
• Packing: 5 m
• Cross-Section: 1,5 mm²
• Outer Diameter: 2,8 mm
• Stranded wire structure: 30 x 0,25 mm tinned copper

Speaker-Cable

• Length: 5 m
• Color: grey
• 1st Jack: Mono 6,3 mm
• 2nd Jack: Mono 6,3 mm
• Cable type: Sommer Cable Typ SC-MERIDIAN SP215 2 x 1,5 mm², grau (#so415-0056)

Speaker-Cable

• Length: 3 m
• Color: grey
• 1st Jack: Mono 6,3 mm
• 2nd Jack: Mono 6,3 mm
• Cable type: Sommer Cable Typ SC-MERIDIAN SP215 2 x 1,5 mm², grau (#so415-0056)

Warm and balanced overall sound, paired with high resolution and brilliance, which is why the TT12AT7 achieves the best results in both instrumental and audio/high-end amplifiers.

Features:

• Warm and balanced sound
• Excellent sound resolution and brilliance
• Ideal for instrumental and audio/high-end amplifiers

Hint;
Often, 12AU7 and 12AT7 types are used instead of 12AX7 tubes in order to either reduce the overall power of the amplifier or just take back the overdrive of the preamp. Especially the 12AU7 brings a very large tonal difference compared to a 12AX7, which is usually much greater than when switching from a 12AX7 to 5751 or 12AT7.

When using a 12AU7 in a driver stage that is normally designed for 12AX7, the overall power of the power amp is usually reduced. How big this difference is depends on the amplifier or circuit. For example, a Marshall with a 12AX7 in the phase inverter stage set to volume 5 will then reach the same volume with a 12AU7 set to volume 6 (perceived volume, not measured).

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 Voltage (Ug1): -2V (typical)
• Anode Current (Ia): 10mA (typical)
• Anode Power Dissipation: Maximum 2.5W per triode
• Anode Resistance (ra): 11kΩ
• Amplification Factor (μ): 60
• Transconductance (S): 5.5mA/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 either 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 disturbances.