02-22-2013, 06:06 PM
My first guess would be 42, although there were also some globe 43 tubes with the Philco brand.
"B2" is the date code, where "2" stands for 1932. I have a paper around here somewhere that gives the letter meanings, each letter is for a different month.
In 1936 (I think), Philco switched to a different date code where the first letter stood for the particular quarter of the year.
O - 1st quarter
P - 2nd quarter
U - 3rd quarter
S - 4th quarter
Sylvania date codes are the same, as Philco tubes were made by Sylvania until 1940 when Philco bought controlling interest in National Union.
"B2" is the date code, where "2" stands for 1932. I have a paper around here somewhere that gives the letter meanings, each letter is for a different month.
In 1936 (I think), Philco switched to a different date code where the first letter stood for the particular quarter of the year.
O - 1st quarter
P - 2nd quarter
U - 3rd quarter
S - 4th quarter
Sylvania date codes are the same, as Philco tubes were made by Sylvania until 1940 when Philco bought controlling interest in National Union.
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Ron Ramirez
Ferdinand IN
