Groove Tubes Valves GT-6L6-R Quartet (Matched)

Russian made, same as the 5881 you are using now, but when these are matched in our system they are

Groove Tubes Valves GT-6L6-R Quartet (Matched)

Russian made, same as the 5881 you are using now, but when these are matched in our system they are improved. These are a very sturdy and reliable tube.

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