Alpha 250 kOhm log Stereo

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

The quiescent current is measured indirectly via a precision resistor built into the adapter. The advantages of this measuring method are harmless voltages in the mV range at the measuring plugs as well as short ways for the current, since it does not have to be led through the measuring device (common practice with many measuring adapters of Far Eastern production). As a result, there is no risk of oscillation of the amplifier, which could damage 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.

Measurement procedure
Determine the resistance of the adapter, including the test leads. Connect the adapter to the meter, but do not connect it between the tubes and the amplifier. Select the ohms range on the meter and note the reading, e.g. 1.1 ohms.
For the final measurement, insert the adapter between the tube and the de-energized amplifier, connect it to the meter, select the mV range 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 using Ohm's law.

Example
Measured voltage = 47 mV, adapter resistance = 1.1 ohms.
Formula (I = V / R) or in this case
Bias Current (in A) = Measured Value (Voltage in V) / Measured Value (Resistance in Ohm)
0.047V / 1.1 Ohm = 0.042A or 42mA

For the calculation of the correct bias current as well as further information on bias measurement please refer to further documents or the bias setting instructions in the info section as well as the manual of the amplifier itself.
This adapter is suitable for all EL34, 6L6, 6550, KT88, 6V6, 6CA7 and other tubes with the same pinout.

Attention HIGH VOLTAGE ! Measurements and work on tube amplifiers should only be done by qualified personnel.

Files:

• Datasheet

• Power Rating: 0,125 W
• Voltage Rating: 150 V AC
• Tolerance: 20%
• Shaft: 6,3 mm, Solid Shaft
• Shaft length: 15 mm
• Drill Ø: M7 (6,8 mm)
• Termination: Solder lugs
• Dimension: 16 mm

• Power Rating: 0,125 W
• Voltage Rating: 150 V AC
• Tolerance: 20%
• Shaft: 6,3 mm, Solid Shaft
• Shaft length: 15 mm
• Drill Ø: M7 (6,8 mm)
• Termination: Solder lugs
• Dimension: 16 mm

• Power Rating: 0,125 W
• Voltage Rating: 150 V AC
• Tolerance: 20%
• Shaft: 6,3 mm, Solid Shaft
• Shaft length: 15 mm
• Drill Ø: M7 (6,8 mm)
• Termination: Solder lugs
• Dimension: 16 mm

• Power Rating: 0,125 W
• Voltage Rating: 150 V AC
• Tolerance: 20%
• Shaft: 6,3 mm, Solid Shaft
• Shaft length: 15 mm
• Drill Ø: M7 (6,8 mm)
• Termination: Solder lugs
• Dimension: 16 mm

• Power Rating: 0,125 W
• Voltage Rating: 150 V AC
• Tolerance: 20%
• Shaft: 6,3 mm, Solid Shaft
• Shaft length: 15 mm
• Drill Ø: M7 (6,8 mm)
• Termination: Solder lugs
• Dimension: 16 mm

• Power Rating: 0,125 W
• Voltage Rating: 150 V AC
• Tolerance: 20%
• Shaft: 6,3 mm, Solid Shaft
• Shaft length: 15 mm
• Drill Ø: M7 (6,8 mm)
• Termination: Solder lugs
• Dimension: 16 mm

Were raw force reigns...

the sound technicians are at work and do not have the time to handle cables with tender love and care. This robust cable is especially intended for speakers and satifies all special technical demands. The oxygen-free copper strand provides better sound and more durability.
All PVC-versions are easy to wind. Versions SP215 and SP225 are now available with highly flexible 0.15 mm copper stranding!
New are the versions in FRNC and E30 (IEC 228, IEC 332-/1, IEC 332-3 Cat C, IEC 60331, IEC 61034-1/2, IEC 60754-2)

THE ADVANTAGES:

• Flexible and easily windable
• Small diameter
• Great durability through the use of a special jacket mixture
• Very affordable

THE APPLICATION:

• All types of sound systems
• For fixed installation
• Wiring of HiFi-systems

• Construction (2LIY1.50mm²)Y
• Diameter 6,8 mm
• AWG 16
• No. of conductors 2 x 1,5 mm²
• Jacket material, insulation PVC
• Copper strand per conductor 84 x 0,15 mm
• Conductor insulation, diameter 2,62 mm
• Temperature range min. -30 °C
• Temperature range max. 70 °C
• Fire load per m 0,28 kWh
• Weight per 1 m 78 g
• Color black

• Capac. cond./cond. per 1 m 150 pF
• Cond. resistance per 1 km < 13 Ohm
• Insulat. resistance per 1 km > 5 MOhm

• Type: Countersunk raised head with cross recess
• Material: Steel
• Strength class: 4.8
• Surface: Zinc-plated
• DIN: 966
• ISO: 7047
• Price: per pcs.

Cliff 1160 mono jack

• Jack socket, mono
• switched
• for chassis mounting, 4 solder terminals
• for 6.3 mm jack plug
• Used by Marshall and many others

• Datasheet