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25Z6

Information - Help 
ID = 1993
       
Country:
United States of America (USA)
Brand:
Tube type:  High-vacuum Rectifier 
Identical to 25Z6
Similar Tubes
Other shape (e.g. bulb type):
  25Z5MG ; 25Z6G ; 25Z6GT ; 25Z6MG
Normally replaceable-slightly different:
  NU-25Z5
Other class quality (otherwise equal):
  CV558
Heater different:
  26Z6
Other base:
  25Z5
First year 1936 -- Collector info (Sammler) >72 models 1936 (market), some with dated ads.
First Source (s)
09.Dec.1935 : Electron Tube Registration List
Predecessor Tubes 25Z5  
Base Octal (Int.Octal, IO) K8A, USA 1935 (Codex=Ue)
Filament Vf 25 Volts / If 0.3 Ampere / Indirect / Specified current AC/DC ~ = (Series working)
Description

Whith two independed diodes to be used as voltage doubler or higher current.
NOT intended as full wave rectifier. [JR]

 
Text in other languages (may differ)
Tube prices 1 Tube prices (visible for members only)
Information source Essential Characteristics, GE 1973   
Taschenbuch zum Röhren-Codex 1948/49   
25z6.png
25Z6: Courtesy Bureau Belper (De Muiderkring, Bussum), Scan Frank Philipse
Karel De Reus †
317_5.png 25Z6: Telefunken Werkstattbuch
Wolfgang Bauer
More ...
Just Qvigstad 		25z6_rca_data_01.png
25Z6: Original data sheet
Michael Poll
More ...
Usage in Models 7= 1936?? ; 11= 1936? ; 71= 1936 ; 10= 1937?? ; 10= 1937? ; 59= 1937 ; 12= 1938?? ; 9= 1938? ; 91= 1938 ; 23= 1939?? ; 24= 1939? ; 90= 1939 ; 20= 1940?? ; 5= 1940? ; 49= 1940 ; 3= 1941?? ; 5= 1941? ; 18= 1941 ; 11= 1942?? ; 6= 1942? ; 3= 1942 ; 1= 1943?? ; 3= 1943? ; 1= 1944?? ; 1= 1944? ; 4= 1944 ; 9= 1945?? ; 3= 1945 ; 7= 1946?? ; 2= 1946? ; 10= 1946 ; 11= 1947?? ; 3= 1947? ; 16= 1947 ; 4= 1948?? ; 2= 1948? ; 10= 1948 ; 1= 1949?? ; 6= 1949? ; 5= 1949 ; 26= 1950?? ; 2= 1950? ; 6= 1950 ; 2= 1951?? ; 2= 1951? ; 6= 1951 ; 4= 1952 ; 1= 1953 ; 2= 1954 ; 2= 1955?? ; 1= 1955? ; 2= 1955 ; 1= 1957
Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):693

Collection of

Christian Schaufelberger (CH)
Peter Pfeiffer (D)
Larry Anderson (USA)
 
25z6_a.jpg

 

Variants

The Arcturus metal/glass type 25Z6 tube is unusual in that it employs a glass disc instead of a conventional "pinch" for introducing the lead-in wires into the glass bulb. The disc has the wires in a circular formation. Also, the use of the disc made the tube around 15 mm shorter.
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