> "## Which I think was the vapor phase cooled version of an 8877."
To the best of my knowledge, Eimac never mass-produced a vapor-cooled
version of the 8877. The 70V uses a 3CV1500A7 and is electrically identical
to the 3CX1000A7. The physical structure is nearly identical, except that
the CV version has a boiler attached to the anode and results in higher
plate dissipation.
Jack Quinn's "Stanley Steamer" amp, shown in the May, 1966 issue of QST uses
a 4CV1500B tetrode. I've never seen this tube but Eimac lists it on page 36
of their 1969 catalog:
http://www.americanradiohistory.com/Archive-Catalogs/EIMAC/Eimac-Catalog-196
9.pdf
The catalog pre-dates the 70V design by one year. So, I would expect to see
the 3CV1500A7 listed the following year. The catalog shows a very
impressive manufacturing operation in San Carlos during Eimac's best years.
By 1975, both the 3CV1500A7 and 4CV1500B are missing in Eimac's annual
catalog.
Paul, W9AC
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