Groove tubes GT-7591-R Low Quartet Tube
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This obscure pentode tube used in some early Gibson amps had had been off the market.
They are made in very low quantities, which is why the relatively high price, but they are a close copy of the original tube.
Quartet of power tube GT-7591-R Low
(Low= 1-3. Rapid distortion, flexible attack, perfect for rock and blues solos)
Ref. Euroguitar : 55719