Nevada Radio

Acom GU-74b

4CX800A Valve for Acom amplifiers

Price:

£399.00

 

Availability:

In Stock

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Description

GU-74b

The GU-74b tetrode is used in wideband nontunable amplifiers and for
single-sideband power amplification in stationary and mobile RF
equipment.

 It is useful at full ratings through 250MHz. The GU-74b
tetrode is generally considered to be similar to the 4CX800A, although
some users report that it acts more like a tube having 900 or 1000W
anode dissipation

General :
  • Cathode: indirectly heated, dispenser, oxide-coated.
  • Envelope: metal-ceramic.
  • Cooling: forced air.
  • Height, mm, at most: 90
  • Diameter, mm, at most: 71
  • Mass, gm, at most: 550


 Enviromental operatimg conditions :

Vibration loads:

  • frequency, Hz 1-200
  • acceleration, m/s² 49
  • Multiple impacts with acceleration, m/s² 392

Ambient Conditions:

  • Temperature, °C -10 to +55
  • Relative humidity at up to +35 °C, % 98

Nominal Electrical Parameters :

  • Heater voltage, V 12.6
  • Heater current, A 3.6
  • Mutual conductance (VA = 1KV, Vg2= 300V, Ia = 600mA, change in Vg1 = 2.5V), mA/V: 32.5
  • Anode current with Va = 2.5KV, Vg2 = 300V, A: >1.4
  • Negative bias (Vg1) with Va= 1KV, Vg2 = 300V, Ia= 600mA, V: 18-32
  • Negative cutoff bias (Vg1) with Va= 1KV, Vg2= 300V, Ia= 15mA, V: 90
  • Input capacitance, pF 51
  • Output capacitance, at most, pF 11
  • Transfer capacitance, pF <0.09
  • Warm up time, s: <150
  • AB1 Output power, Va = 2KV, Vg1= -60V, Vg2 = 300V, Ig2< 50mA, Freq. 0.1-1.0 MHz, W: >550
  • 3rd-order energy relative to carrier, Va= 2KV, Vg2 = 300V, Ig2< 50mA, Vg1 = -70V, dB: -28
  • 5th-order energy relative to carrier, Va= 2KV, Vg2= 300V, Ig2< 50mA, Vg1= -70V, dB: -28
  • Designed Tube Life (hours) >1500


Electrical parameter limits :

  • Heater voltage, V 11.9-13.3
  • Heater current, A 3.3-3.9
  • input capacitance, pF 46-56
  • output capacitance, pF 9-13
  • Maximum CW Anode voltage (Va), KV: 2
  • Maximum Instantaneous value Anode voltage (Va), KV: 4
  • "Maximum" Control Grid voltage (Vg1), V -150
  • Maximum Screen Grid voltage (Vg2), V 300
  • CW cathode current (Ic), A: 0.75
  • Peak cathode current (Ic), A: 2.5
  • Anode Dissipation, W: 600
  • Screen Grid (G2) Dissipation, W: 15
  • Control Grid (G1) Dissipation, W: 2
  • Frequency, MHz: <250



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