I pulled my original SSB Manual and you are correct, the original "Four In
Line" was grid driven. There was an article in QST in the late 1950s or early
1960s that told how to convert this linear (or build a new version) using
grounded grid. The instructions for modifying the 1625 tubes was included.
For some reason, I modified some 1625 tubes but never got around to building
the linear! This was when I was in high school.
I found a couple of those tubes when I was trying to clean up the shack a few
months ago!
Glen, K9STH
Website: http://k9sth.com
--- On Thu, 2/12/09, Gary Schafer <garyschafer@comcast.net> wrote:
The "four in line" was four 1625s mounted in line that were grid driven in push
pull parallel arrangement. Each side of the push pull circuit had two tubes in
parallel.
Getting old when you remember this stuff.
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