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0H3

Information - Help 
ID = 57966
       
 
   
Tube type:  Voltage Regulator, single   Power-supply 
Identical to 0H3 = 90C1

Base Miniatur-7-Pin-Base B7G, USA 1940
Filament No heater
Description 90V 1-40mA. Dual marking for 85A2. Probably this code was assigned for a JEDEC registration of the 90C1, never completed.

The 0H3 appears on some North American supplied tubes with dual 90C1 and OH3 markings on the tubes and boxes.
The origin of specimens are from both the UK's Mullard Mitchan factory, and Philip's Heerlen factory. It is possible that these tubes were rebadged in North America.

In common with other earlier 90C1 tubes, they share the coding of the 85A2. 

Information source -- Collector info (Sammler)   
 
philips0h3.jpg
0H3: Philips 0H3 tube
John Albion

 
85a2.png
0H3: Manufacturer's Literature
Emilio Ciardiello

 

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