On Mon, 9 Jan 2006 15:53:45 UTC, wrote:

Very old B4 and similar valves, yes, but the more modern DF series of
B7G and B9A based valves were surely 1.4 volts weren't they? The OP
did say 1.5 volts rather than 2.0 volts.

Yes, by definition, if it used the European numbering system and began
with D, it was 1.4v for the filament/heater. Designed to run off dry
cells (I had a radio with those for years...a portable too!).

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