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A quad set of National Union 6SN7GT labeled Mitchell all with same date code 52-31 This is one of the most underrated 6SN7GT tubes out there. A very reasonably priced tube given it’s outstanding performance characteristics, so don’t miss your chance to have this fantastic tube in your collection. Why? This tube has one of the more unique sounds out there – very dark, very chocolaty, but is able to maintain very good top end extension. Vocals are a bit more forward than in RCA for example, but that makes the presentation more personal – add a fantastic smoothness of the tube to the mix and you have yourself quite a combo. HIGHLY RECOMMENDED! All tubes are tested using a Sencore Continental MU140 tester and are fully guaranteed to work without issue. All images shown are of the actual tubes.