The GT-5881C Power Tubes Duet features a Groove Tubes exclusive high-power 5881 "short bottle" design.
This is a very high-vacuum tube, the GT-5881C is very stable.
This tube type gives you a sweet tone and defined character that was a mainstay in the Fender tweed era amps of the 1950s and early 1960s.
The tube's short height allows for easy use in rackmount-style amps
Groove Tubes power tubes are matched and rated in low, medium and high output levels.
Most amp manufacturers bias their amps for tubes in the “medium” range, and replacement of stock tubes frequently do not require re-biasing if “mediums” are purchased.
- For softer feel, quicker distortion and creamier tone, we suggest “lows”
- For more dynamic headroom and tighter, quicker and harder overall response, we suggest “highs”.
Lows and highs are more likely to require re-biasing by a qualified service technician to meet your
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