Tube modeled after the one made by RCA 6L6GC, has more gain than Sovtek 5881WXT (about 20% more). This tube is one of the best 6L6s manufactured today due to its low noise and microphony which gives it an excellent score for details and harmonic content. It withstands voltages between 425V to 500V very well and its adjustment in Bias is very pleasant. High durability