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Hammond 290UEX Spare for Fender Hot Rod Deluxe

Description

Used in Hot Rod Deluxe 021-3202-000
Fender No: 36958
Core: Paper

Files:

Datasheet

Manufacturer

Herstellerinformationen | Manufacturer Information
Hammond Manufacturing Co. Ltd.
394 Edinburgh Rd. N.
Guelph, Ontario
Canada N1H 1E5
https://www.hammondmfg.com

EU-Wirtschaftsakteur | EU Economic Operator
Tube-Town GmbH, Rumbergring 37, 66969 Lemberg, Germany, info@tube-town.de

Hammond Manufacturing is a renowned manufacturer of electrical and electronic products based in Canada. The company was founded in 1917 and has since established a reputation for producing high-quality enclosures, transformers, electronic components, and other device components.

Hammond Mfg is distinguished by its many years of experience, innovative products, and rigorous quality controls. Hammond's products are used in a variety of industries, including electronics, telecommunications, medical technology, industrial automation, and consumer electronics.

Tube-Town has been working with Hammond Mfg for decades and is a distributor for all types of transformers, chokes, and reactors, with a focus on tube technology, as well as enclosures and chassis.

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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

15,10 €