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23
Dimension
and connections:
22
KT 88 - (6550)
KT 88
A. F. BEAM PENTODE
Base:
OCTAL
U
f
=
6,3 V
I
f
=
c
a
1,6 A
Typical characteristic:
U
a
=
250 V
U
g2
=
250 V
I
a
=
140 mA
I
g2
=
max. 7 mA
-U
g1
=
15 V
S
=
11,5 mA/V
R
i
=
12 k
Ω
µ
-g1-g2
=
8
Triode Conncected
U
a, g2
=
250 V
I
a+g2
=
147 m
A
-U
g1
=
15 V
S
=
12 mA/V
R
i
=
670
Ω
µ
=
8
Limiting values:
U
a
=
800 V
U
g2
=
600 V
U
a, g2
=
600 V
-U
g1
=
200 V
W
a
=
42 W
W
g2
=
8 W
W
a-g2
=
46 W
I
k
=
230 mA
U
k/f
=
250 V
R
g1-k
(catode bias)
W
a+g2
≤35 W 470 k
Ω
W
a+g2
>35 W 270 k
Ω
R
g1-k
(fixed bias)
W
a-g2
≤35 W 220 k
Ω
W
a+g2
>35 W 100 k
Ω
Capacitances:
c
g1
=
16,5 pF
c
a
=
10 pF
c
g1-a
=
2,3 pF
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