Tube-Town GmbH

FR4 board for the construction of Turret boards

• Size: 100 x 500 x 3 mm

• Size: ca. 80 x 100 cm (only available in this size)
• Material:
  • 97% treated paper
  • 3% Polyester
• Price per pcs.
• Actual shades may vary

• FAQ Grillcloth

• Length: 240 mm
• Width: 55 mm
• Solder Lugs: 2 x 30
• Distance between Solder Lugs: 8,3 mm
• Laminated Paper

• Type: Noval Socket
• Version: Ceramic Chassis mount
• w/ mounting bracket
• Termination Style: solder lugs
• for Tube Type: 12AX7, 12AT7, 12AU7, EL84, EZ81, EL844 etc.

• Type: Noval Socket
• Version: Ceramic Chassis mount
•   w/ mounting bracket Gold
• Termination Style: solder lugs Gold
• for Tube Type: 12AX7, 12AT7, 12AU7, EL84,
•   EZ81, EL844 etc.

• Ceramic
• Gold-Plated Pins
• for Tube Type: 12AX7, 12AT7, 12AU7, EL84, EZ81, EL844 etc.
• Set of 2 sockets

• Chassis mount
• Used in Fender Preamps
• With solder lugs
• for Tube Type: 12AX7, 12AT7, 12AU7, EL84, EZ81, EL844 etc.

Noval Socket

• Ceramic
• Chassis mount with shield
• Termination Style: solder lugs
• for Tube Type: 12AX7, 12AT7, 12AU7 etc.

• Type: Noval Socket, Pack with 1 sockets
• Version: Ceramic
• Termination Style: print  mount
• for Tube Type: 12AX7, 12AT7, 12AU7, EL84, EZ81, EL844 etc.

• w/mounting bracket
• solder lugs
• for 12AX7, EL84 and similar

• Type: Noval Socket, Pack with 2 sockets
• Version: Ceramic
• Termination Style: print  mount
• for Tube Type: 12AX7, 12AT7, 12AU7, EL84, EZ81, EL844 etc.

• Material:  Bakelit
• for Tube Type: EL34, 6L6, KT88, 6V6, 6550 etc.

Noval Socket - Pack of 5

• Ceramic
• Chassis mount with shield
• Termination Style: solder lugs
• for Tube Type: 12AX7, 12AT7, 12AU7 etc.

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

• Type: 7-Pin Socket 7EK
• Version: Ceramic Chassis mount
• Termination Style: solder lugs
• for Tube Type: 12K5 etc.

• Type: 7-Pin Socket 7EK
• Version: Ceramic
• Termination Style: Print mount
• for Tube Type: 12K5 etc.

• Type: Pan Head, slotted
• Material: Steel
• Strength class: 4.8
• Surface: Zinc-plated
• DIN: 84
• ISO: 1207
• Price: per pcs.

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

• Type: Hex Head
• Material: Polyamide
• Color: white
• ISO: 4017
• Price: per pcs.

• Type: US-Standard Flat Head, cross recess
• Material: Steel
• Strength class: 4.8
• Surface: Zinc-plated
• Price: per pcs.