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Stenode

Information - Help 
ID = 42605
       
Country:
United States of America (USA)
Brand: Stenode Corp. of America; Long Island, NY
Developer: Stenode Corp. of America; Long Island, NY 
Tube type:  Quartz Crystal, Oscillator or Filter   RF/IF-Stage 
Identical to Stenode

Base UX-Base (4 Pins (2 thick, USA 1924, UX) Top contact with a cap.
Was used by Radio/TV-reception etc.
Filament No tube or solid state / No heater
Description

The stenode or "Stenotube" (Lafayette 10th Anniversary catalog page 34 from 1932) is the heart of the Stenode circuit and consists of a quartz crystal ground to 175 kc, mounted in tube form for easy handling. Standard UX socket base. James Robinson, then engineer fo the "Receptite Company" of London, England, is the inventor. The Stenode was offered by Lafayette in 1931 for $ 14.70 - which then was really not cheap!

In October 1930 Radio News brought an article for the "Stenode Radiostat" which should have "completely altered the future of radio": Just ahead of the second detector of a Superheterodyne is used a triode instead of a screen-grid tube for the superior power-handling of the triode. "The quartz crystal is used instead of a number of sharply-tuned cascade resonant circuits in order to obtain high selectivity; and that used in the Radiostat has a decrement of the order of 0.00004. It is obvious that the selectivity given by such an arrangement is much higher than could be easily obtained by a more normal method of cascade tuned circuits. The band width passed by this crystal circuit is only about 50 cycles; consequently any interference on a frequency different from the frequency of the desired station by more than 50 cycles should be completely eliminated."

 
Information source Radio News   October, November and December 1930
Radio Craft   August 1931
-- Collector info (Sammler)
  stenode_radiostat_10_tube_circuit.png
  Stenode: Fin Stewart
Fin Stewart
 
stenode_quartzcrystal.png
Stenode: R.O.
Rudolf Osterkamp

 
stenode_radiostat_last_if_stage_with_crystal.png
Stenode: Fin Stewart
Fin Stewart


from Just Qvigstad

Usage in Models 1= 1930

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):1

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