GU-48 (original box)

Description

 The GU-48 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.

Equivalent tube: RCA 833A

Stamp of technical control department of the manufacturer “ОТК“ 

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

• Filament current: 10 ± 0.8A
• Anode current (at Uс1= -50V): 130 ± 70A
• Anode current (at Ua=0.1KV, Uc1=100V): 700 ± 200mA
• Grid current (at Ua=Uc1=100 V) 215 ± 85mA
• Reverse grid current (at Ia= 150 mA): 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: 9.5-10.5V 
• Anode voltage: 3KV 
• Filament starting current: 15A 
• Anode dissipation: 300W 
• Operating frequency: 75MHz 
• Envelope temperature: 270°C

Operating time not less than 1000 hours.