Genalex Gold Lion KT77 Matched Quad

Out of stock

Genalex KT77 Gold Lion Platinum matched pair

The KT77 is ideal as an audio tube but is also worth trying in guitar amplifiers as an alternative to the 6CA7 or EL34.
Set of four

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More Information
Tube type KT77
Manufacturer/Brand Genalex
Production New
Tube kind Powertube
Construction Beaming Tetrode
Pin Layout Octal 8 pins
Country of Manufacture Russia

Genalex KT77 Gold Lion matched quad
In the 1950s, Marconi-Osram Valve Co. introduced (GENALEX) the successor of the KT66 the KT77 as a direct competitor of the EL34 with which it is in most cases also directly interchangeable. The KT77 is ideal as an audio tube but is also worth trying in guitar amplifiers as an alternative to the 6CA7 or EL34. Since then, the Gold Lions Marconi-Osram Valve Co. very difficult to obtain and very expensive. After thorough research, New Sensor has recreated the KT77 to the smallest detail. The result is one of the very best KT77 of the current production.

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.

Genalex / Marconi Osram Valves
The Marconi Osram Valve Company Ltd. was founded by General Electric Company (Osram) and the Marconi Company in 1919 to join forces to meet the increased demand for electron tubes. In 1937, Marconi Osram introduced the KT66 Beam Tetrode. KT stands for Kinkless Tetrode which refers to suppression of the characteristic unwanted bend that you see at the bottom of the Anode Voltage / Current curve at a Tetrode tube. Because Philips / Mullard solved this phenomenon by adding an extra grid to the supressor grid to counteract the secondary emission of the Anode. This is how the Penthode patented by Philips was born. Because of this patent, the competition had to find a different solution and this resulted in the 'Beam Tetrode' in which the electron flow directed (beam) from the cathode to the anode was bent by the use of so-called beam forming plates in the tube, which caused the secondary emission of the anode was greatly reduced. The first 'Beam Tetrode' power tube was the American 6L6 of RCA made under license from Marconi Osram because the latter thought that this type of tube was not suitable for mass production which was a costly mistake now that the 6L6 is one of the most successful tubes and can still be found in many guitar amps.