Electro-Harmonix 6L6GC Power Tube
The Electro-Harmonix 6L6GC Power Tube is also called the 6L6-EH. Modeled after the vintage RCA 6L6GC “black plate,” the 6L6-EH tube features large plate dimensions and improved grid structure for increased power handling capabilities. Also features mica spacers with metal springs to eliminate tube rattle and microphonics.
The 6L6-EH offers tone and performance superior to any other 6L6 or KT66 type.
A bit about the 6L6
Radio Corporation of America (RCA) introduced the 6L6 vacuum tube in mid 1936, it was widely used in many applications, military included. It quickly found popularity in guitar amplifiers. The original 6L6 valve was contained within a black metal tube or casing.
Other versions of the 6L6 valve included the 6L6G, 6L6GA, 6L6GB, and the final version which was the 6L6GC – these all had glass envelopes which improved the radiation cooling of the anode.