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Base B5

    
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This base, a B4 with a centre pin, was introduced in 1928. Originally the centre pin was used for the cathode connection in indirectly heated valves.

In the original pin layout given to the R-type and subsequently used for countless later designs: Pin one connected to the anode, pin two was for the grid and pins three and four were for the filament.

An unusual square surface mounting B5 valve holder.

The pin-outs below refer to the data researched by Keith R Thrower OBE.

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