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CV1285

Information - Help 
ID = 15689
       
Country:
Great Britain (UK)
Brand: Common type Great Britain tube/semicond.
Tube type:  Double Triode   Power/Output 
Identical to CV1285 = NR73 = W1280 = ECC31

Base Octal (Int.Octal, IO) K8A, USA 1935 (Codex=Ud)
Filament Vf 6.3 Volts / If 0.95 Ampere / Indirect / Parallel, (AC/DC)
Description 300V max anode voltage, 6mA anode current, mu 32. 
Literature Taschenbuch zum Röhren-Codex 1948/49   
-- Original-techn. papers.   
 
ecc31.jpg
CV1285: RFJ
Roy Johnson

 
cv1285_so.png
CV1285: ARRL Handbook 1972
Michael Schlör

 
cv1285nr73_1_1.png
CV1285: Manufacturer's Literature
Emilio Ciardiello



Forum contributions about this tube
CV1285
Threads: 1 | Posts: 2
Hits: 1626     Replies: 1
CV1285
Robert Sarbell
24.Aug.05
  1 I respectfully ask the members who are most interested in the precise determination of tube data to please help resolve a dilemma that eludes me.

I have had for quite a long time what appear to been 2 original ST14-shaped tubes made by Sylvania (they are still in what I believe are the original Sylvania cartons) and have the number 1285 printed on the top. They are in the early green and black carton and the outline designation 14Z is printed on the package.

I have seen several times a tube matching the ST 14 outline, with the octal base, and it is identified as the CV1285, a dual triode, and also cross referenced as replacement for the ECC31 tube. The tube data identifies the tube as having the 6.3V filament voltage, and other characteristics.

However, my Hickok tube tester data sheets list the following to test a "1285" tube:

FILAMENT: 25.0 V

SELECTOR POSITIONS: 7 2 5 0 - 3 4 8 0

BIAS: 0

SHUNT: - - -

MULT: X10

PRESS; S4 (indicates low plate position)

MIN. MUT. COND: 500

The above test data for the Sylvania 1285 does not agree with the data that we have listed for the CV1285. I would be most appreciative if a member could enlighten me on this small matter.

Respectfully,
Robert Sarbell

Attachments

Robert Sarbell
24.Aug.05
  2 I apologize for the stupid question. . . . . . . .I have determined the exact nature of the peculiar "1285" tube.

It can be thought of as a dual triode or equally well as a tetrode, and both are perfectly acceptable answers.

Respectfully,
Robert Sarbell
 
CV1285
End of forum contributions about this tube

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