Groove tubes GT-6550-C High Quartet Tube
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A softer version of the older USA 6550A, with a nice distortion character.
This tube has a distortion that is between a 6L6GC and a 6550A. In older Marshall's that have 6550's, this tube will give you more compression and distortion at lower levels than the other 6550 offerings.
This tube is terrific in Class A amps such as the GT Solo Single when you want to have a lot of output for smaller live venues.
Many people prefer these in some Marshall amps where more clean headroom and output is desired.
Quartet of power tube GT-6550-C High
(High= 8-10. Many dynamic, power in clear sound, ideal for musicians in search of power, for jazz and bass amp)
Euroguitar Reference : 55660
