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The JJ - KT77 is a brand new tube. A KT77 directly replaces any EL34 or 6CA7.
KT77 A. F. BEAM PENTODE
Base: OCTAL  
Uf = 6,3 V
If = cca 1,4 A
Typical characteristic:
U a = 250 V
Ug2 = 250 V
-Ug1 = 15 V
Ia = 100 mA
Ig2 = 10 mA
S = 10,5 mA/V
Ra = 23 K.
µ = 11,5
Limiting values:
U a = 800 V
Ug2 = 800 V
Ua,g2 = 800 W
Wa = 25 W
Wg2 = 6 W
Wa,g2 = 28 W
Ik = 180 mA
Uk/f = 150 V
-Ug1 = 200 V
Capacitances:
C g1 = 16,5 pF
Ca = 9 pF
Ca/g1 = 1 pF
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