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The Philips-Mullard (PM) Series
collections HMS Collingwood |
The PM24 dates from 1928 and later versions such as the PM24A operated at twice the anode voltage and gave 2.5 Watts of output.
The top of the envelope shows filament and anode voltage, as well as identifying the valve. The double vision effect is the reflection from the inner surface of the envelope that is silvered due to the firing of the magnesium getter during final manufacture.
The balloon envelope is 47 mm in diameter and, excluding the B5 base pins, is 86 mm tall.
Pin Connections
The top of the envelope shows filament and anode voltage, as well as identifying the valve. The double vision effect is the reflection from the inner surface of the envelope that is silvered due to the firing of the magnesium getter during final manufacture.
The balloon envelope is 47 mm in diameter and, excluding the B5 base pins, is 86 mm tall.
Pin Connections
The balloon envelope is 47 mm in diameter and, excluding the B5 base pins, is 86 mm tall.
Pin Connections
Pin Connections
