Quote:
Originally Posted by Maarten
Quote:
Originally Posted by Synchrodyne
As a starting point, what were probably the final Philips datasheet issues for these valves were dated respectively 1999 June 12 for the EAA91 and 1999 June 14 for the EB91.
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Are you sure those aren't the dates that Frank Philipse (a private person unrelated to the company), compiled those sheets? |
I think that thy are Philips’ own dates. I have attached the said datasheets, also that for the EB41.
In the usual Philips way, each page has its own data. I have taken the issue (or really reissue) date to be that of the final page.
The actual data in the EAA91 case dates from 1954, as does the limited data provided for the EB91. The “refer to the EAA91” statement also dates from 1954 June 06, so a reasonable inference is that by mid-1954, if not earlier, Philips viewed the EAA91 as being the parent type and the EB91 as a derivative. That aligns with the presentation in the 1954 Pocket Book. The EB41 data dates from 1952.
Cheers,