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2A5E

Information - Help 
ID = 3094
       
Country:
United States of America (USA)
Brand: Common type USA tube/semicond.
Tube type:  Vacuum Pentode   Power/Output 
Identical to 2A5E
Similar Tubes
Normally replaceable-slightly different:
  2A5
Heater different:
  18E ; 42E

Base 6-Pin-Base U6A, old, USA (Codex=K)
Filament Vf 2.5 Volts / If 1.7 Ampere / Indirect / Parallel, (AC/DC)
Description G3 connected w/ g1 inside the tube.__[JR] 
Text in other languages (may differ)
Literature Taschenbuch zum Röhren-Codex 1948/49   
 
usa_2a5e_tungsol_eb.jpg
2A5E: ma collection
Anonymous 550 Collector

 
2a5e_so.png
2A5E: ARRL Handbook 1972
Michael Schlör

 

Usage in Models 1= 1934?? ; 1= 1936 ; 1= 1937 ; 3= 1938

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):6

Collection of a member from CH

Forum contributions about this tube
2A5E
Threads: 2 | Posts: 2
Hits: 1622     Replies: 0
2A5E (2A5E)
Jacob Roschy
22.Mar.08
  1 Apparently the tubes 2A5E, 18E, 42E and most probably the 6F6EG are special versions of 2A5, 18, 42 and 6F6G.

They distinguish against their normal versions in that way, as their grid # 3 (suppressor grid) is connected to grid # 1 (control grid), instead of being connected with cathode, as usually.

In Europe the tube company Tungsram followed this fashion by releasing some tube types of the same peculiarity and called them "Tetraforte". Known type were at least the PP415 as direct heated type and the APP4120 as indirect heated tube.

Apparently, both the PP415 and the APP4120 were also available as normal penthodes, with g3 connected to cathode.

It would be interesting to find articles and other information about these tubes in contemporary literature of the early 1930s. By now, we know very little, with exception of some schematics and base diagrams, where the g3 to g1 connection is visible.

Best Regards , Jacob

 
Hits: 1778     Replies: 0
2A5E : Gitter 1 & 3 parallel !
Jacob Roschy
21.Mar.08
  1 Gitter 1 & 3 parallel !


Siehe Artikel hier: &

 
2A5E
End of forum contributions about this tube

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