GU-50 (original box)

Russian tube generator beam pentode GU-50 (ГУ-50 rus.) used as a generator and amplifier of high-frequency oscillations at frequencies up to 120MHz. The GU-50 tube is used in transmitters, in low-frequency amplifiers. Working position – vertical.

Near equivalent tube: FU-50, LS-50

• Stamp of technical control department of the manufacturer ” ОТК “

Technical specifications: (at Un=12.6V, Ua=0.8kV, Uc2=0.25kV, Uc3=0V, Ia=50mA)

• Filament current: 0.705 ± 0.065A
• Anode current: not less than 50mA
• 1st grid current: no more than 8mA
• 2nd grid current: no more than 5mA
• 1st grid reverse current (at Ic2=15mA): no more than 15µA
• 3rd grid reverse current (at Ic2=15 mA): no more than 25µA
• Leakage current between cathode and heater: no more than 100µA
• Permeability of the 1st grid relative to the 2nd grid: 19 ± 3%
• The voltage of the 1st grid at the operating point is negative: 40 ± 10V
• 3rd grid turn-off voltage negative: 205 ± 55V
• Slope: 4 ± 1mA/V
• Oscillatory power:

– at Un=12.6 V not less than 60W

– at Un=10.8V not less than 52W

Limiting operational characteristics:

• Filament voltage: 10.8 – 14.5V
• Anode voltage: 1kV
• Voltage of the 2nd grid: 0.25kV
• Voltage between cathode and heater: 200V
• Anode current: 230mA
• Power dissipated by the anode: 40W
• Power dissipated by the 2nd grid: 5W
• Power dissipated by the 1st grid: 1W

Operating time not less than 1750 hours.