Groove tubes GT-7591-R High Duet 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.
Pair of power tube GT-7591-R High
(High= 8-10. Many dynamic, power in clear sound, ideal for musicians in search of power, for jazz and bass amp)
Euroguitar Reference : 55718