GS-35B 2,5kW Power Tube. New in Box! 



With 4kV on plate >3.0 kW can be expected on 144MHz in a grounded grid amplifier!


Intermodulation distortion of the 3rd order - minus 32 dB

Anode Dissipation - 2.5 kW

Grid Dissipation - 26 W

Cathode- Oxide coated Heater voltage - 12,6V

Heater current - 2.95A

Maximum CW Anode voltage -4.0 kV

Maximum Instantaneous value Anode voltage-8.0 kV

Maximum CW Cathode current-1.4 A

Transconductance at Ua= 2.0 kV Ia = 350 mA -->32.5 mA/V

Capacitance Input /Output /Feed-through / -21 pF /4.4 pF/0.12 pF-Max.

Seal and Envelope Temperature -200 C

Maximum Length -177 mm Maximum Diameter -100 mm

Weight with heat sink: 2.5 kgs

Operating Position -Any

The so called "Specification Sheet" for the GS-31B/GS-35B was provided for the tubes as they were produced in the Soyus (Union-engl.) factory for the Russian military and select civil aviation customers. These tubes were produced primarily for use in UHF RADAR applications. The factory was manufacturing the tube in such a manner as to guarantee their performance under the specified conditions. The plate dissipation of 1,500 watts was a MINIMAL CONSERVATIVE rating for this tube in service above 800 MHz. Use of this tube in the spectrum occupied by the amateur bands 160 meters through 70 centimeters was never specified nor measured.  You can also exceed the rated anode voltage specification of 3,000 volts to as much as 4,500 volts. The majority of users are operating their amps with anode voltages between 2,500 and 3,000 Volts. They make a mistake and the grid current overload. It is better use the maximize anode voltage.

Caution should also be exercised when operating the tube with filament voltages that may go below the nominal 12.6 volts. If your line voltage drops enough to cause your filament voltage to go below this level, you should adjust the filament voltage so that it will stay at or slightly above 12.6 volts under all conditions. Low filament voltage not only contributes to rapid tube failure, it will also cause your tube to have low output. Some users claim to run the filament voltage as high as 14 volts. Unlike directly heated cathode tubes, significant loss of the oxide coating on the indirectly heated cathode can occur with low filament voltages. High filament voltage can significantly shorten the life of the tube. You may shorten the life of the tube slightly by raising the filament voltage but not nearly as much as you will shorten it running low voltage. Always provide for a method to test and adjust your filament voltage.

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We sale the NEW GS-35B(GS35B) Tubes in original packing with a tube passport! Click to QRO-Parts image for buy GS-35B Tubes!