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ID = 35550
Brand: Common type Worldwide tube/semicond.
Tube type:  Reflex Klystron   SHF/EHF (>3 GHz) 
Identical to 2K56

Base Octal with RF-contact (long)
Was used by Industrial
Filament Vf 6.3 Volts / If 0.45 Ampere / Indirect / Specified voltage AC/DC

3840 to 4860 MHz tuning range; 100 mW output power. 723A/B format.
Raytheon, RCA and WE known manufacturers.

Dimensions (WHD)
incl. pins / tip
41 x 91 x 30 mm / 1.61 x 3.58 x 1.18 inch
Weight 60 g / 2.12 oz
Information source Tube Lore (I)   p. 47
- - Manufacturers Literature   RFT-Spezialröhren, 1960

Just Qvigstad
2K56: RFT-Spezialröhren 1960
Anonymous 15 Collector

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