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ID = 35552
Tube type:  Reflex Klystron   UHF 
Identical to 5981 = RK5981
Similar Tubes
Other characteristic (electr. data):
  5649 ; 5650

Base Octal with RF-contact (long)
Filament Vf 6.3 Volts / If 0.455 Ampere / Indirect

1245 to 1400 MHz, integral cavity, coaxial out probe through the octal-like base. 250V, 134mW output typical at 1390 MHz. 5981/RK5981 replaces both 5649 and 5650.
Raytheon, SFR and Sperry known manufacturers for this device.

Dimensions (WHD)
incl. pins / tip
41 x 128 x mm / 1.61 x 5.04 x inch
Information source -- Original-techn. papers.   
- - Manufacturers Literature   
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