General Electric 12AU7 black plate - matched quad

In stock

NOS General Electric 12AU7 matched quad, 1984

This NOS GE 12AU7 is a double triode with low gain. Popular in guitar and audio amplifiers as low noise line driver.
Set of four.

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More Information
Tube type 12AU7
Manufacturer/Brand General Electric
Production NOS
Tube kind Signaltube
Construction Dual Triode
Pin Layout Noval 9 pins
Country of Manufacture United States

General Electric 12AU7 black plate
General Electric 12AU7 in a JAN (Joint Army Navy) version matched with black plates.

GE (General Electric)
Founded by Thomas Edison, the inventor of light bulb, in 1892, General Electric or GE for short has become one of the largest corporations in the world.
Important steps towards the improvement of the electron tube by GE are a better diffusion pump to create a better vacuum in the tube and a process to prolong the life of the tungsten filament (tungsten wire or filament in English).
In the 1950s, GE started a project to improve the lifespan and reliability of their tubes and this resulted in the so-called 'Five Star Series'. The best-known signal tube in that series is the GL-5751 a tube with a 30% lower gain than the 12AX7

In 1945, GE took over the famous tube brand Ken-Rad (Kentucky Radio Corporation) and continued to produce tubes in Kentucky under that name until 1952

TubeDirect strives to offer both GE and Ken-Rad NOS tubes in its product range. This NOS (New Old Stock, not second-hand) tubes are used by reliable suppliers from the USA and tested for delivery by us and provided with an individual test report. Multiple tubes of the same type are matched as much as possible. See also our articles about testing and matching tubes.

Matched tubes 
This set of tubes is matched. This means that the measured values of the tubes fall within the same range and thus perform equally.
This is important for two reasons:
1. To obtain the same gain factor per tube.
2. For the same amount of quiescent current per tube.
The first requirement speaks for itself and the second requirement prevents the one tube where a higher quiescent current or bias is needed to make it work in the linear region will also be worn out earlier. Both new tubes and our NOS tubes can be ordered separately.