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Groove 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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$114.48
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Most common low power pentode, popularized in early Vox AC30 amps. Rediscovered by Matchless amps and now currently used by nearly every tube amp company. Quick, soft overdrive distortion, great for recording. European version with even more response, higher power and warmer tone.
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$37.95
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