Best KT77 listed at:

KT77 Genalex Gold Lion / GEC England
The KT77 is designed primarily for use under ultra-linear conditions (43% taps, Class AB1 push-pull) and this connection is recommended. Similar performance can be obtained in the tetrode connected mode, but the output impednace (zout) will be higher. Life expectancy=5000 hours when operated at maximum ratings (32W) or 10,000 hours when operated at (25W) KT77 MAX RATINGS: ---------------- Vfil=6.3V @ 1.4A Vplate = 800V Vscreen = 650V Pa = 32 watts Pscreen = 6 watts DC Cathode current = 200ma
KT77 Gold Lion / GEC England "SOFIA" Computer Curve Trace settings (Vplate=450VDC, Vgrid = -12V) TO BUY KT77
PAIRS: ----- listed below 1 pair $799) KT77 Gold Lion by M-O Valve UK 1979 same date codes low hours/test like new, strong pair 1 tube) 67ma Gm=11600 1 tube) 64.5ma Gm=11200 listed below 1 pair $789) KT77 Gold Lion by M-O Valve UK 1979 same date codes low hours/test like new, strong pair 1 tube) 59ma Gm=11000 1 tube) 56ma Gm=10700 SINGLE TUBES: ------------ BLACK BASE: ---------- listed below 1 tube $425) KT77 Gold Lion NOS black base (7913=1979) very good condition, original box with data sheet (60.5ma) (best single) listed below 1 tube $275) KT77 Gold Lion black base (7920=1979) some scratches on the bases, good top getter used/tests like new 54.5ma (recommended) listed below 1 tube $250) KT77 Gold Lion black base (7920=1979) some scratches on the bases, good top getter used/good, top getter like new 50ma (recommended) listed below 1 tube $225) KT77 Gold Lion black base (7920=1979) some scratches on the bases, good top getter used/good 80%, top getter like new 48ma BROWN BASE: ---------- listed below 1 tube $350) KT77 Gold Lion by M-O Valve Hammersmith, England like new (7848=1978), perfect top getter, reboxed (55.7ma) (recommended) (gold lion is smeared on glass, tube is probably NOS with smeared printing) listed below 1 tube $325) KT77 GEC thin brown base used/tests like new reboxed (7729=1977) slightly faded getter, perfect white printing (75ma) listed below 1 tube $275) KT77 Gold Lion by M-O Valve Hammersmith, England, like new, top getter like new, smeared yellow printing, thin brown base, in white box, 1970's (47.7ma)
SONIC COMMENTS in Bob Gjika KT77 amp: ------------------------------------ Hey Brendan, I received the KT77s safely. They are beautiful and in immaculate condition . You certainly don't sell junk and I appreciate that a lot considering the cost of these tubes. They are running beautifully in my Gjika KT77 amp and you are correct about these tubes, they ARE the Cadillac of EL34s (more like a Bentley or Rolls Royce) My God, they are unreal sounding and will NEVER come out of this amp. I'm a Happy man! Thanks JAMES B.