GU-48

 The GU-48 (ГУ-48 rus.) is a power triode intended for use in RF amplifier, oscillator, or class B modulator service. The GU-48  features rugged construction for high power RF transmitter applications. The envelope is fabricated from hard glass intended specifically for the high-temperature operation of transmitting tubes. The internal tube parts are supported by low loss ceramic insulators for high-temperature operation and high voltage hold-off.

Triode GU-48 is equivalent to an RCA 833A tube.

Stamp of technical control department of the manufacturer “ОТК“ 

Technical specifications (at Un=10V, Ua=2.5KV, Ia=500mA):

• Filament current: 10A ± 0.8A
• Anode current (at Uс1= -50V): 130A ± 70A
• Anode current (at Ua=0.1KV, Uc1=100V): 700mA ± 200mA
• Grid current (at Ua=Uc1=100 V) 215mA ± 85mA
• Reverse grid current (at Ia= 150mA): no more than 25µA
• Gain (when Uc changes by 20V, Ia=200mA) 35 ± 6
• Oscillatory power (at Ic1=95mA, at 40MHz): not less than 700W

Limiting performance:

• Filament voltage: 9.5V…10.5V 
• Anode voltage: 3KV 
• Filament starting current: 15A 
• Anode dissipation: 300W 
• Operating frequency: 75MHz 
• Envelope temperature: 270°C

Operating time not less than 1000 hours.