Interesting design of the electrode system:
The lamp has a cylindrical blackened anode of small radius (1) with a large outer rib and a directly heated oxide-thorium cathode (2).
Short spaced leads and flat leg (3) provide low interelectrode capacitance and high cut-off frequency
(Ska = 0.8 pF, fadm = 3000 MHz)
A metal holder (4) is placed in the upper part of the cylinder.
Noise diodes tube 2D2S (2Д2C – cyrilic.).
The noise diode with the thorium oxide cathode of direct heat.
It is intended for generation of noise, measurement of sensitivity of amplifiers and receiving devices very high frequencies of the range in equipment of a special purpose.
Longevity at least 400 h.
Mass no more than 30 g.
Main technical characteristics 2D2S:
Rated electrical data:
Heat tension ........ 1.4 ±0,2 V
Filament current........ 1.45 ±0.15 A
Leakage current between the anode and the cathode (in case of Ua =-200 V)........ no more 10мкА
The steepness of the characteristic of current of the anode (in case of Ua = 135 V)........ no more than 0,08 mA / V
Coefficient of nonlinearity of noise........ no more than 10%
Capacity between the anode and the cathode........ 0.57 pF
Limit operational data:
Heat tension........ 1.2 - 1.7B
Anode tension........ 140 V
Reverse voltage........ 200 V
Anode current........ 40 mA
Steepness of the characteristic........ 0.1 mA / V
The capacity dispersed by the anode........ 5 W
Interval of working temperatures of environment........ from –60 to +70 °C
This never been used, from the old stock.
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