Ceramic-metal tetrode GU-138B with indirectly heated oxide cathode with forced air cooling of the anode, power dissipated by the anode, 10 kW, is intended for use in broadband terminal stages of HF and VHF radio transmitters, including for linear amplification of a single-sideband signal.

1. Heating voltage 27 V.
2. Glow current at a voltage of 24 V 11 A.
3. Cathode – oxide indirect heating.
4. Zero anode current, not less than 20 A at Ua=0.6kV, Uc2=450V, Uc1=0V.
5. Interelectrode capacitances (circuit with a common cathode):

– Input 300 pF,
– Output 43 pF,
– Pass 1.3 pF.

6. Maximum frequency 100MHz.
7. Height 170 mm.
8. Diameter 176mm.
9. Weight, no more than 5 kg.
10. Cooling – forced air.
11. Maximum sheath temperature 220°C.

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Extended warranty is available upon request and is agreed individually; it may affect the final product price.