Philips kt88s DATASHEETS
KT88S
Beam
Tetrode
The KT88S has an absolute maximum anode dissipation rating of 50W and is designed for use in
the output stage of an a.f. amplifier. Two tubes in Class AB1 give a continuous output of up to 120W.
The KT88 is also suitable for use as a series tube in a stabilised power supply.
HEATER
V
.................................................................................................................................................................................
h
6.3 V
Ih (approx.) ..........................................................................................1.6 A
MAXIMUM RATINGS
Absolute and Design Maximum
a
.....................................................................................................................................................................
V
V
...................................................................................................................................................................
g2
V
................................................................................................................................................................
a,g2
-V
.................................................................................................................................................................
g1
p
......................................................................................................................................................................
a
p
....................................................................................................................................................................
g2
p
................................................................................................................................................................
a+g2
I
........................................................................................................................................................................
k
V
..................................................................................................................................................................
h-k
T
.................................................................................................................................................................
bulb
R
(cathode bias)
g1-k
p
<40W .................................................................................. 470 kΩ
a+g2
p
>40W .................................................................................. 270 kΩ
a+g2
800 V
600 V
600 V
200 V
50 W
8W
59 W
230 mA
250 V
250
Rg1-k (fixed bias)
p
<40W .................................................................................. 220 kΩ
a+g2
p
>40W .................................................................................. 100 kΩ
a+g2
o
C
(Revised 3/1/96)
P E N T A L A B O R A T O R I E S
9740 COZYCROFT AV. * CHATSWORTH * CALIFORNIA 91311
(800) 421-4219 * (818) 882-3872 * FAX: (818) 882-3968
ELECTRON TUBES FOR INDUSTRY
-
KT88S BEAM TETRODE
CAPACITANCES (measured on a cold unscreened tube)
Triode Connection
C
C
C
...................................................................................................................................................................... 7.9 pF
g1-a,g2
g1-all less a,g2
a,g2-all less g1
..........................................................................................................................................................
..........................................................................................................................................................
9.3 pF
17 pF
Tetrode Connection
C
........................................................................................................................................................................... 1.2 pF
g1-a
C
g1-all less a
C
a-all less g1
...............................................................................................................................................................
...............................................................................................................................................................
16 pF
12 pF
CHARACTERISTICS
Triode Connection
V
............................................................................................................................................................................
a,g2
I
..............................................................................................................................................................................
a+g2
-Vg1
(approx.)
g
................................................................................................................................................................................
m
r
...................................................................................................................................................................................
a
.............................................................................................................................................................
250 V
143 mA
15 V
12 mmho
670 Ω
µ.................................................................................................................... 8
Tetrode Connection
V
.................................................................................................................................................................................
a
V
...............................................................................................................................................................................
g2
I
....................................................................................................................................................................................
a
Ig2
-Vg1
g
m
r
...................................................................................................................................................................................
a
µ
g1-g2
..................................................................................................................................................................
(approx.)
(approx.)
................................................................................................................................................................................
.............................................................................................................................................................
...........................................................................................................................................................................
TYPICAL OPERATION
Push-Pull. Class Ab1, Cathode Bias, Tetrode Connection
V
.............................................................................................................................................................................
a(b)
V
.............................................................................................................................................................................
a(o)
V
...............................................................................................................................................................................
g2
I
................................................................................................................................................................................
a(o)
I
a (max signal)
I
g2(o)
I
g2 (max signal)
R
L(a-a)
*R
...............................................................................................................................................................................
k
-V
g1 (approx.)
P
out
D
tot
...............................................................................................................................................................
..............................................................................................................................................................................
.............................................................................................................................................................
..........................................................................................................................................................................
..............................................................................................................................................................
..............................................................................................................................................................................
..............................................................................................................................................................................
250 V
250 V
140 mA
3mA
15 V
11.5 mmho
12 kΩ
8
560 V
521 V
300 V
2 x 64 mA
2 x 73 mA
2 x 1.7 mA
2 x 9 mA
9kΩ
2 x 460 Ω
30 V
50 W
3%
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