6N28B-V Double Triode URSS Military NOS HI-Durable TUBE RARE!!

Lot of 4 pcs.

 RUSSIAN NOS TUBES 6N28B-V

Military equipment,"OTK", high reliability.6N28B-V, in double vibration resistant miniature triode increased reliability. Designed to enhance the low frequency voltage and generating high-frequency oscillations. Durability is not less than 2000 hours. The weight of not more than 5 g Nuvistor 6N28B-B. This dual triode indirectly heated, designed for VLF. Do not have a clear microphone effect, thus, has a miniature size. 6N28B-In - a very good solution for making pre-amplifier, background corrector.

6N28B-V

Name 6N28B-V Type Double triode,shock-proof,hi-durable Application LF voltage amplification,HF oscillation Cathode type oxide,indirect heating Envelope glass,miniature Mass,g 5 Filament voltage,V 6,3 Filament current,A 0,225-0,27 Anode voltage,V 50 Anode current,A 0,004-0,01 Anode power,W 0,9 Grid1 voltage,V minus 1 Steepness,mA/V 4,5-9,0 Reverse grid current,uA 0,1 Microphnic noise,mV 10 Gain 16-28 Socket type flexible