[Hallicrafters] 5-pin socket pin-out / The plot thickens

[W7QHO at aol.com]

In a message dated 7/10/08 9:34:39 PM, magnuson at mac.com writes:


> However the set I am trying to get operating is a 1933
> Grebe with 1933 tubes and no pin numbering on the schematic.  The RCA
> Receiving Tube Manual for the tubes I am trying to test (24A and 27) is
> consistent with pin 3 being the isolated pin and pins 1 & 5 opposite
> being the filament. 
> 

The earlier handbooks are very spare on tube base information.   A few 
pictorial drawings only and no numbers at all, at least in my 31 and 32 handbooks.   
Tubes in those days were predominately 4-pin types which seem to have been 
consistently wired with pins 1 and 4 (as now numbered) being the filament, pin 2 
the grid and pin 3 the plate.   Likewise, the 5 pin triodes seemed to have 
been consistently 1 & 5-heater, 2-cathode, 3-grid and 4-plate.   The pages of 
base diagrams with which we are all familiar came along later.

Dennis D. W7QHO
Glendale, CA



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