Groove Tubes GT 6550 R Tube DuetGroove Tubes GT-6550-R Duet Highest power pentode for use in Marshall, Hiwatt, Ampeg SVT, the GT amps and a few other higher powered amps. Also popular for HiFi amps. Excellent response, yet it's easier to push into distortion than "A" version, a little harder sounding than "C".
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| Groove Tubes GT 6550 R Tube Duet |