Quote:
Originally Posted by electroking
What do you call 'static focus'? According to my RCA RC-29 Tube Manual
(1973), all B&W CRTs listed have either Electrostatic focus (a grid that
you connect to the correct potential, sometimes with taps, sometimes
with a potentiometer) or Magnetic focus (a focus coil). The only two
tubes that list a different focusing method (Automatic) are two test
tubes (8XP4 and 8YP4).
My two TVs, from 1956 and 1960, use electrostatic focus tubes
(21ALP4A, 90 deg. and 21DEP4, 110 deg.).
Regards.
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Here is where my lack of electrical knowledge is going to kick me in the butt. I thought electrostatic focus was from a focus coil, and a static focus was using an adjustable PM maginet around the neck of the tube.
Now that I have thought of it my 66 color roundie uses a grid in the tube for focus. Electrostatic. My 21 inch B/W uses a focus coil, and my other B/w TV uses a PM maginet for focus.
Someone help me get my ideas straight here!
Thanks!!
Matt Davala