On 2024-08-07 01:12,
peter@easthope.ca wrote:
Hi,
Photo of the bulb and box here. http://easthope.ca/Bulb25T6.5.jpg
145 V, 25 W.
I googled. I found one reference to a DC max of 145.
https://www.vintage-radio.net/forum/showthread.php?t=98436
«I have seen 140/145 volt DC supplies, but in that case the 140/145
volts was the MAXIMUM not the nominal voltage.
Normally a 116 or 120 volt nominal lead acid battery charged by an
engine driven dynamo. Lighting circuits would be supplied by a voltage regulator so as to give a roughly constant 115 volts on the lamps.
Power circuits direct from the battery and therefore up to about 140/145
volts when the engine was running.»
And this other:
«I can't throw any light on when or where 140VAC supplies were used, but
100 years ago, as GEC used to supply lamps for this sort of voltage.
In the GEC catalogue for 1911-12, while the most common voltage ranges
for which lamps were supplied were 100-130V and 200 - 260V, certain
types were available at pretty well any voltage. The customer was asked
to specify the required voltage when ordering, hence the voltage ranges mentioned were ranges that were available and did not represent the
range of voltages over which a particular type of lamp could be used. A
range of 150-155V is specified for one particular type of lamp,
suggesting that there was a demand for lamps of this particular type for
use with a nominal 150V supply.»
--
Cheers, Carlos.
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