GS-31B Tube. New in Box.
1,5 KW up to 500 MHz
HF-VHF-UHF POWER COAXIAL TRIODE
With 3kV on plate >1.8 kW can be expected on 144MHz in a grounded grid amplifier!
Intermodulation distortion of the 3rd order - minus 32 dB
Anode Dissipation - 1.5 kW
Grid Dissipation - 22 W
Cathode- Oxide coated Heater voltage - 12,6V
Heater current - 3.4A
Maximum CW Anode voltage - 3.0 kV
Maximum Instantaneous value Anode voltage- 6.0 kV
Maximum CW Cathode current-1.4 A
Cathode pulse current-8.0 A
Transconductance at Ua= 2.0 kV Ia = 350 mA -->22.5 mA/V
Capacitance Input /Output /Feed-through -19 pF /3.8 pF/0.12 pF-Max.
Seal and Envelope Temperature - 250 C max
Anode Temperature - 200 C max
Cathode Connector Temperature - 120 C max
Maximum Length -147,0mm Maximum Diameter -100,2mm
Weight with heat sink: 1.2 kgs
Operating Position -Any
Blower - 3.0 m3/h -->according to the manufacturer datasheet,see:
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 1,000 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 4,000 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.
More information? Very recommend!
GS-31B is high-frequency version of GS-35B tube
indirectly heated, oxide-coated. Envelope: metal-ceramic. Cooling:
forced air or Water cooling.
You wanted 1500 watts VHF?
should also be exercised when operating the
tube with filament voltages that may go below
12.6 volts. If your line voltage drops enough
your filament voltage to go below this level,
adjust the filament voltage so that it will
or slightly above 12.6 volts under all
conditions. Low filament
voltage not only contributes to rapid tube
it will also cause your tube to have low
users claim to run the filament voltage as
high as 14 volts.
Unlike directly heated cathode tubes,
of the oxide coating on the indirectly heated
can occur with low filament voltages. High
filament voltage can significantly shorten the life of the tube. You may
the life of the tube slightly by raising the
voltage but not nearly as much as you will
running low voltage. Always provide for a
test and adjust your filament voltage. The best way is the filament voltage stabilizer
Delivery to U.S. via Texas storage.
Shipping cost includes heavy tube delivery from Russia to Texas.