27 Dec
2006
27 Dec
'06
7:44 p.m.
Chris M wrote:
--- Brent Hilpert <hilpert at cs.ubc.ca> wrote:
There's only really 3 variables,
- voltage, actually %boost, so it may be consistent across the range
- current, may not vary enough to be an issue
- tube base pinout
So they should be fairly generic with a few types covering many make/models.
The other trick in the old days was the picture
tube
booster, a small
autotransformer plugged in between the chassis
connector and the CRT to boost
the filament voltage and run the cathode hotter.
After the CRT deteriorated
further you might have it re-gunned.
I obtained a brand new one of these, probably
specific to a particular make/model, but don't ask me
which (it ain't in front of me). I had also heard that
there's something called an "age switch", but I have
to wonder if the guy was pulling my leg, cuz I never
found one. But possibly it employed a technique like this?
I've never seen an age switch either, but it's conceivable there was something
built-in for the boost (extra tap on the filament winding maybe, or jumper
across a resistor), although it would be a surprise to see a mnuafacturer
going to the expense.