6L6 Tube Reviews

The 6L6, introduced by RCA in 1936, was the first beam power tube and remains one of the most important. Versions such as the 6L6GC and the ruggedized 5881 power countless guitar amplifiers, including many Fender models, as well as classic hi-fi amplifiers.

Below are our listening reviews of 6L6-family tubes with reader star ratings. Check your amplifier’s bias and plate ratings before mixing versions. See also our 6V6 and KT66 reviews.

Mullard 6L6GC Russia

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Mullard 6L6GC Russia

(27 votes, average: 3.85 out of 5)

New Sensor has introduced a fresh contender to the market: the Mullard 6L6GC Russia. While New Sensor positions these as a “rugged, reliable replacement” specifically tailored for Marshall JTM-45 reissues and Bluesbreaker combos, there is a historical twist here—the original British Mullard factory never actually produced a 6L6GC. This makes this “reissue” an entirely new beast rather than a carbon copy of a vintage classic.

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