Denne gangen en utmerket versjon av High-Mu Twin Triode 6SL7:
5691 Special Red Tube.
Intended for critical industrial applications where 10000-hour life, extreme uniformity,
rigid construction, and exceptional stability are paramount. Within its ratings, the 5691
may be used to replace its receiving tube counterpart, type 6SL7GT, where heater
transformer will carry increased current.
NOS rør er best og varer lengst *)
NOS vacuum tubes are vastly superior to current production tubes.
Re. Eric Brabour, one of the world’s leading authorities on vacuum tube technology