RCA 5751, black plate matched quad

Out of stock

RCA 5751 black plate NOS matched pair, 1964

Beautiful NOS tube set from the RCA for both guitar and audio applications.
Set of four.

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More Information
Tube type 5751
Manufacturer/Brand RCA
Production NOS
Tube kind Signaltube
Construction Dual Triode
Pin Layout Noval 9 pins
Country of Manufacture United States

RCA 5751 black plate NOS matched quad, 1964
The RCA 5751 NOS is a double triode with medium gain. Popular in guitar and audio amplifiers as input tube or for more headroom in a guitar line amplifier stage.

RCA or Radio Corporation of America was founded in 1919 by General Electric (GE) and Westinghouse with the aim of providing communication between shipping traffic. The tubes that came on the market under the name RCA Radiotron were made by GE and Westinghouse until 1931.
The best known tube of RCA Radiotron is the Beamtetrode 6L6. This was initially produced under the license of Marconi-Osram as the American version of the KT66. The first 6L6 tubes were provided with a black coated metal casing which was replaced by glass from the 6L6G (G stands for Glass).

TubeDirect aims to be able to offer RCA 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.