Svetlana SED Winged C SV6550C matched pair

In stock

Svetlana SED Winged ‘C’ SV6550C matched pair

Famous Svetlana SED Winged 6550C, the NOS beaming powertube used in many guitar (bass) amplifiers by, among others, Fender and in many  audio amplifiers.
Set of two.

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More Information
Tube type 6550
Manufacturer/Brand Svetlana
Production NOS
Tube kind Powertube
Construction Power Triode
Pin Layout Octal 8 pins
Country of Manufacture Russia

Svetlana SED Winged ‘C’ SV6550C matched pair
This SED Winged 'C' of the original beaming powertetrode developed by Tung-Sol in 1955 is one of our NOS 6550 power tubes. The 6550 put on the market as a more robust power tube (100 Watts in complementary setup) than the EL34, 6L6 and 6CA7; The English counterpart of the 6550 came on the market a year later as the KT88.

Svetlana SED, St. Petersburg
Founded in 1912 as a manufacturer of light bulbs, Svetlana (meaning: white light) has been producing vacuum tubes since 1928. During the heyday of the cold war, 30,000 people worked at Svetlana and the company was one of the most important suppliers of tubes (radar tubes such as klystrons) to the Soviet army. When in the Western hemisphere vacuum tube manufacturers closed gradually down and one completely switched over to transistors, SED continued to produce tubes in St. Petersburg and other Svetlana production sites. When there was renewed interest in audiotubes from the West, the American company Svetlana Electron Distributors (SED) was granted the right to distribute Svetlana St. Petersburg tubes in the US under this name using the so-called Winged 'C' (the Cyrillic S ). New Sensor has acquired the brand name Svetlana and now produces tubes under this name in its Saratov factory. After a century Svetlana St. Petersburg has decided to cease production since 2012 and the SED Winged 'C' tubes can now be regarded as NOS 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.