Well, getting ready to go to a trade show, so won't be back here until Friday.
When I get back there's some projects to do:
Keltron/Atari high voltage power supply.
Interesting thing here is that, although both
Cinematronics and Electrohome uses the
same 19VARP4 picture tube the specs are
different! (anode voltages are at NO load,
even though current specs are given):
Cinematronics specs are:
16,000 volts @ 250 uAmp
400 volts @ 1 mAmp
90 volts @ 8 mAmp
(focus grid of tube is grounded)
input voltage is 25 volts
Electrohome specs are:
12,000 volts @ 200 uAmp
400 volts
90 volts
(focus is adjustable 0 to 400 volts)
input voltage is 40 volts
Vector yoke project. Object is to take an
inexpensive TV yoke and see how hard it would
be to rewind it for vector. Horizontal windings
would be OK as-is, vertical would need rewound
to match horizontal.
Color vector high-voltage supply project. Need to
find data on the care and feeding of a 19VLUP22.
Anyone know if the Ampliflame tube uses the same
voltages?
G08 "bullet-proof" deflection board project. I have
come up with a bipolar/FET cascoded output circuit
with possibilities. It has current limiting built in and,
in theory, is more than a match for anything a Sega
vector could do to a monitor. But theory doesn't always
get you there, so there will have to be cruel and inhumane
tortures tried on the circuit first before releasing it on an
unsuspecting world. It is an odd circuit, to say the
least. I have a friend that is into custom modification of
high power audio amps that I'll chat with first. His
modified amps have a habit of NOT dying, so his input
will be valued. But the circuit DOES look like it could
handle full deflection into a shorted yoke without damage,
time will tell.
If any of this flies I'll probably have someone else build them,
just don't have that kind of time.
Received on Mon Jun 14 00:38:24 1999
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