Talk:Acorn tube
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Latest comment: 10 years ago by PRR in topic NiCad? Unlikely IMHO
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""Types 957, 958 and 959 are for portable equipment and have 1.25 V NiCd battery heaters.""
Is there some verifiable support for the "NiCad" statement?
Personal recollection is that NiCad was almost unknown in the US (where acorns were developed) until after the acorn period was over.
The RCA 1938 Announcement sheet for 957-959 actually says "...can be operated ... from a single flashlight dry cell", i.e. Carbon-Zinc primary cell.
Frank's Vacuum Tube Data Sheets: http://www.mif.pg.gda.pl/homepages/frank/sheets/084/9/957.pdf First page.
Carbon-Zinc cells, widely used for hearing aids and battery radios, are 1.5V fresh but must be drained to below 1.0V to get most of their capacity. The 1.25V nominal splits the difference of 1.5V and 1.0V.