I see a lot of Burroughs/ITT 5870 tubes from 1973, and I have boxes of
National Electronics 5870 and 4998 tubes with date codes as late as
1980. Although National Electronics was in the habit of stamping the
current date on old stocks as they were sold - I once had a hundred
5870L tubes with 2002 date codes!
On 10/1/2016 10:56 AM, gregebert wrote:
Most of my Burroughs tubes were
manufactured between 1963 and 1966, and perhaps a straggler from the
early 1970's.
--
David Forbes, Tucson AZ
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