ID:
2393
Maker's Name:
Philips
Where made:
Holland
Dimensions:
2 × 2.3 × 7.4 cm
This valve was used in transformerless domestic radios as the audio output stage, driving a loudspeaker.
The filament was connected in series with other valve filaments drawing the same current.
The supply voltage was higher than the combined voltage requirements of the filaments. A series ballast resistor or barretter valve absorbed the excess voltage.
Book reference:
Philips Miniwatt Technical Data 7th ed 1967
