GU-40B

Powerful generator tetrode tube GU-40B for operation as a generator and broadband amplifier of high-frequency oscillations at frequencies up to 250MHz. Design – metal-glass. Operating position – vertical, glass cylinder up.
Cooling – forced: anode – air not less than 250 m³/h (130 for GU-40B-1 m³/h), legs – air not less than 60 m³/h, cylinder – air, not less than  60m³/h.

Stamp of technical control department of the manufacturer “ ОТК “ 

GU – generator tubes with a generation frequency from 30 to 300MHz
40 – the number of the serial number of the development of this type of tube
B – letter indicating the type of forced cooling

Technical specifications (at Uн=6.3V, Uа=1kV, Uc2=800V, Iа=1A):

• Heating current 33 ± 3A
• Cathode emission current (at Uа=Uc2=Uс1=200V): 4.5A
• Characteristic slope 18 ± 2mA/V
• Gain of the 1st grid relative to the 2nd grid: 10
• Output power (at a frequency of 250MHz and a bandwidth of 8MHz): 1kW
• Interelectrode capacitances, pF:
  input: 30 (34 for GU-40B-1)
  output: 12
  pass: 0.3 (0.5 for GU-40B-1)

Limiting performance:

• Heating voltage 6 – 6.6V
• Anode voltage 5kV
• 2nd grid voltage 830V
• 2nd grid voltage without excitation in the 1st grid circuit 900V
• Starting heating current 50 (55 for GU-40B-1)A
• Power dissipated by the anode 2kW
• Power dissipated by the 2nd grid 75W
• Power dissipated by the 1st grid 30W
• Temperature of the glass and metal-to-glass fusion points 150 (200 for GU-40B-1) °C
• Range of operating ambient temperatures from -60 to +70 °C

Weight: 1600g.

Operating time not less than: 1000 (2000 for GU-40B-1) hours.