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The Groove Tubes GT-12AT7 preamp tube is manufactured to the highest quality JAN spec. NOS
The Groove Tubes GT-12AX7-C preamp tube brings back the ever-popular and sorely missed Chinese 12AX7!
These Groove Tubes Gold Series GT-6L6-R Matched Power Tubes are Russian made, same as the 5881, but matched in the GT system.
The Gold Series GT-E34L-S Matched Power Medium (4-7 GT Rating) Quartets are an exclusive GT design with special "heat wings" attached to the plate for more power, longer life, and better tone.
The GT EL34M is based on the original Mullard EL34 of the \'60s -the stock tube in most early Marshall and Hiwatt ampsBig, fat and well-defined tone and really "wakes up" reissue amps to perform like the originals
Groove Tubes GT-EL-34M Matched Quartet Medium Rating
Groove Tubes GT-EL34-R Ratind Medium Matched Duet