Description
The P1 made by Cossor here shown have bakelite base made around 1924-1925. The P1 and P2 are bright emitter without getter. The anode has a semi-circle shape where filaments are located inside this ‘structure’ makes it suitable for a correct working order, no spring and no hooks to make filament tight. This valve was made for A.F. amplifier. Tested and in working order.
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