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P1_Cossor

Information - Help 
ID = 19386
       
Country:
Great Britain (UK)
Brand: Cossor, A.C.; London
Developer: Cossor, A.C.; London 
Tube type:  Triode, vacuum   Universal 
Identical to P1_Cossor
Similar Tubes
Other characteristic (electr. data):
  P2_Cossor
First Source (s)
1922 : Saga of the Vacuum Tube, Tyne p.375
1922 : British Radio Valves - The Vintage Years, Thrower p.29,30

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914 (Codex=Eo)
Was used by Radio/TV-reception etc.
Filament Vf 3.5 Volts / If 0.7 Ampere / Direct / Battery =
Description

Vademecum is in error: not 0.085 A, and not equivalent to RE074!
Plain top. For AF amplification and Detector.

 
Tube prices 1 Tube prices (visible for members only)
Information source Saga of the Vacuum Tube, Tyne   1925 Brown Brothers Catalog 217
 
cossor_p1.jpg
P1_Cossor: Courtesy Enrico and Richard Tedeschi
Roy Johnson

 
b4_base_pins~~160.png
P1_Cossor: Fin Stewart
Fin Stewart

 
p1_cossor_spec.png
P1_Cossor: Banneitz, TB der drahtl. Teleph. 1927
Anonymous 15 Collector


from Just Qvigstad

Usage in Models 1= 1922

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


Forum contributions about this tube
P1_Cossor
Threads: 1 | Posts: 1
Hits: 1591     Replies: 0
P1_Cossor (P1_Cossor)
Adalbert Gebhart
15.Jun.15
  1

Good evening

I just found a tube that looks much like a Cossor P1 in an original Cossor P-Type box,

printed "P.1." on it.

The tube has the typical Cossor tin-hat anode and is obviously a bright emitter

(see picture @3,5V/0,8A). It has no coloured spot.

 

However, it differs from other Cossor P1 tubes in some respect:

1. It has a one-sided metal mirror inside - most of the others don't

2. It has a black socket instead of a brown one

3. There is no type information etched in the glass dome.

4. However it has etched in the glas dome: "VALCO Ltd.   REPAIRED   Wimbledon" (see pictures)

Maybe our english colleagues have information about this repair company and wether it might be a P1 despite of the differences.

Best regards

Adalbert Gebhart

 

Attachments

 
P1_Cossor
End of forum contributions about this tube

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