1 Matched pair PSVANE KT88-T MK II Premium Grade Vacuum Tubes KT88 DIY parts | Электроника

1 Matched pair PSVANE KT88-T MK II Premium Grade Vacuum Tubes KT88 DIY parts | Электроника

1 Matched pair PSVANE KT88-T MK II Premium Grade Vacuum Tubes KT88 DIY parts

KT88-TII 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-TII is similar with CV5220 and 6550,they can be replaced by each other.

Heater

Uf ……………6.3 V

If…………………………1.6 A

Maximum Rating

Ua……………………800 V

Ug2………………600 V

Ug1………………-200 V

Pa………………42 W

Pg2…………8 W

Ua+g2…………46 W

Ik……………………230 mA

Uh-k……………200 V

Tbulb…………………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

tetrode connection triode connection

input………16 9.3 PF

output ……… 12 17PF

grid to plate………1.2 7.9 PF

tetrode connection

Ua…………………… 250 V

Ug2……………………250 V

Ia ……………………140 mA

Ig2(approx) ………3 mA

-Ug1(approx)………15 V

Gm ……………………12 mA/V

ri ……………………12 KΩ

Ug1-g2……………… 8

ri ……………………670 Ω

u………………………8

triode connection

Ua.g2…………………250 V

Ia+g2…………………143 mA

-Ug1(approx)………15 V

Gm ……………………12 mA/V