- Mica spacers with metal springs eliminate tube rattle and microphonic
- Superior tone and performance to most other 6L6 or KT66 types
- Platinum pair (2 tubes), computer-matched by manufacturer on proprietary equipment
- 5881 equivalent
Power Beam tetrode with large plate dimensions and improved grid structure for increased power handling capabilities. Modeled after the vintage RCA 6L6GC "black plate".