KT88 is a beam power tetreode, its anode limited dissipation power is 42W. In the audio amplifier, the power can be 100W when it is used as push-pull class AB1 with double tubes, it can also be used in electronic voltage regulator circuit. KT88 is similar with CV5220 and 6550,they can be replaced by each other.
Heater
UH………… 6.3 V
IH………… 1.6 A
Maximum Rating
------------- --KT94 KT100 KT94 KT100
Ua……………… 800 800 800 800 V
Ug2………… 600 600 600 600 V
Ug1…………-200 -200 -200 -200 V
Pa………… 42 45 35 40 W
Pg2…… 8 8 6 6 W
Pa+g2… 46 49 40 45 W
Ik……………… 230 230 230 230 mA
Uh-k……… 200 200 250 250 V
Tbulb……………… 250 250 250 250 C
Rg1
with cathode bias
--- ---Pa + Pg2≤ 35W 0.47 MΩ
--- ---Pa +Pg2 > 35W 0.27 MΩ
with fixed bias
--- ---Pa +Pg2≤35W 0.22 MΩ
--- ---Pa +Pg2> 35W 0.10 MΩ
Direct Interelectrode Capacitances
--- - - --triode connection and tetrode connection
input……… 16--- -9.3 PF
output……… 12 --- -17 PF
grid to plate……… 1.2 ----7.9 P
Static parameter
tetrode connection
Ua…………………250V
Ug2……………… 250V
a………………… 140mA
Ig2(approx)…… 3mA
-Ug1(approx)……15V
Gm………………… 12mA/V
ri …………………12KΩ
μg1-g2…………… 8
triode connection
Ua.g2……………250V
Ia+g2……………143mA
-Ug1(approx)… 15V
Gm…………………12mA/V
ri…………………670Ω
μ………………… 8