Vacuum Tube - KT77, Genalex Gold Lion

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Vacuum Tube - KT77, Genalex Gold Lion

Starting at: $48.95
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Genalex Gold Lion KT77 beam-power tetrode tube. Made in Russia.

A beam tetrode with an absolute maximum anode dissipation rating of 32 watts. The KT77 is designed for use in the output stage of an af amplifier. Two valves in Class AB1 give a continuous output of over 70 W.

Item ID:
Part Numbers
Single or MatchedOur Part NumberUPC/EAN
Matched PairT-KT77-GEN-MP841358102561
Matched QuadT-KT77-GEN-MQ841358102578
Product Measurements
Amplification Factor11.5
Bulb Temperature250°C
Capacitance, Grid to Others16.5 pF
Capacitance, Plate to Others9.0 pF
Capacitance, grid to plate1.0 pF
Cathode Current (Ik)200 mA
Grid Circuit Resistance (Rg), Cathode Bias1 MΩ
Grid Circuit Resistance (Rg), Fixed Bias0.5 MΩ
Grid Voltage (Ug)-220 V
Heater-Cathode Voltage (Uh/k)200 V
Heater Current1.4 A
Heater Voltage6.3 V
Plate Dissipation (Wa)32 W
Plate Resistance (Ra)23 kΩ
Plate Voltage (Ua)≤ 800 V, 250 V typical
Screen Dissipation6.0 W
Screen Voltage≤ 650 V, 250 V typical
Transconductance (S)10.5 mA/V
Packaging Information
Packaging DimensionsMatched Pair version4.79 in. × 3.47 in. × 1.74 in.
Matched Quad version4.79 in. × 3.47 in. × 3.47 in.
Single version4.75 in. × 1.75 in. × 1.75 in.
Weight (Packaging)Matched Pair version1.072 lbs.
Matched Quad version0.528 lbs.
Single version0.132 lbs.

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Specifications, Files, and Documents

PDF: Specification Sheet Specification Sheet2.09 MB

Questions and Answers

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Asked by harleytech on June 5th, 2017.
Matt H
June 7th, 2017
Yes, the KT77 is a suitable replacement for an EL34 and a rebias will most likely be in order.

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