advert from June 1950 extols the virtues of their multi-voltage radio
battery. With outputs for high tension (120V) and low tension (and /
or grid bias) of 3V, 4½V and 6V this complex battery was well suited to
portable radios of the time.
Whilst they say that Vidor "last a
month longer", pasted over an annual calendar - they don't exactly
say how long that is!
What a beast - and of course impossible to
source these days. Collectors of portables from this era are
condemned to taping together multiple modern batteries or building quite
complex mains based battery eliminators.