How many volts is the Summit Kt-88 rated for (UA rating, maximum value) ? Also, have not been able to see its technical specs anywhere. Please advise. Thanks.
Thank you for your inquiry. Please find the specifications for the SUMMIT KT88 below:
Heater Voltage
Uh .................................................... 6.3 V
Ih ..................................................... 1.6 A
Maximum Ratings
Anode Voltage .................................... 800 V
Screen Grid Voltage ............................ 600 V
Control Grid Voltage ............................ –200 V
Anode Dissipation Power ..................... 42 W
Screen Dissipation Power ..................... 8 W
Combined Anode + Screen Dissipation ... 46 W
Cathode Current .................................. 230 mA
Heater-to-Cathode Voltage .................... 200 V
Bulb Temperature ................................ 250 ℃
Control Grid Resistance
Self-bias
— When Pa + Pg2 ≤ 35 W .................... 0.47 MΩ
— When Pa + Pg2 > 35 W ..................... 0.27 MΩ
Fixed bias
— When Pa + Pg2 ≤ 35 W .................... 0.22 MΩ
— When Pa + Pg2 > 35 W ..................... 0.10 MΩ
Inter-electrode Capacitances
(Tetrode Connection / Triode Connection)
Input Capacitance .............................. 16 / 9.3 pF
Output Capacitance ........................... 12 / 17 pF
Grid-to-Plate Capacitance .................. 1.2 / 7.9 pF
Static Parameters
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
µ (g1–g2) .............................................. 8
Triode Connection
Ua+g2 ............................................... 250 V
Ia+g2 ............................................... 143 mA
Ug1 (approx.) .................................... –15 V
Gm .................................................... 12 mA/V
ri ......................................................... 670 Ω
µ .......................................................... 8
