Sovtek 5881 Power Tubes - Matched Quad
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These Sovtek 5881WXT tubes are in platinum matched sets. Sovtek’s platinum matching process consists of a 24-hour tube burn-in period followed by a bias (plate) current measurement in milliamps.
Built to rigid military standards, the Sovtek 5881WXT will tolerate higher voltages than most other 6L6 tubes.
The Sovtek 5881WXT power tube is the same as the 5881 but with a full-size base for easy installation in vintage amp designs. Used by Fender, Crate, Carvin, and amplifier manufacturers. Mesa Boogie relabels them STR425.