26 Oct
2009
26 Oct
'09
10:56 p.m.
This was once somewhat common. ?Some of the CRTs made
for high-end oscilloscopes were so complex that it was fiscally prudent to replace the
filament when it burned out. ?-- Ian
Common TV CRTs were also rebuilt in the 1950s.
Earlier this year I sold some 4CX50000s to a power tube rebuilder, and
he gave a nickel tour of his plant. Very cool - he could (and did)
take apart a number of scrap tubes, use the parts, and make a good one
out of the pile.
On a related note, I am in need of a 21M44P31A tube for a Cyber
console. Tube rebuilding is not an option, as the phosphor has been
splotched due to the breaking of the neck.
--
Will