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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
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.
These Groove Tubes Gold Series GT-6L6-R Matched Power Tubes are Russian made, same as the 5881, but matched in the GT system.
ECC83S is 12AX7 high gain pre-amplifying double triode
Duet Matched Tubes JJ EL34 selected.
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!
ECC83-Cz TAD Premium Selected
Groove Tubes GT-EL34-R Ratind Medium Matched Duet
Groove Tubes GT-EL-34M Matched Quartet Medium Rating