Ian Field wrote:


"Cydrome Leader" wrote in message
...
Ian Field wrote:


"Cydrome Leader" wrote in message
...
Ian Field wrote:


"Leif Neland" wrote in message
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F?lgende er skrevet af Phil Hobbs:

When I was a kid, I used to get dead TVs and take them apart for the
components. To get rid of the picture tubes, I put them in a
Rubbermaid
trash can and shot out the faceplate with my slingshot.

As a kid I unwrapped the capacitors to find the interesting stuff
inside
all that wrapping paper. Never found anything, though... :-)

When I was a kid, someone gave me a regen set in a very grand wooden
cabinet.

When I'd finished breaking it - it was time to take it apart and see
what's
in it.

In a compartment under the one the chassis was in, there was a huge
flat
profile paper capacitor - one that big could only have been the HT
reservoir.

Think of all the things I could've got up to with that if I hadn't
unraveled
it!

I dragged a huge transformer out of a TV set to grade school once to
show
people the huge sparks that could be drawn off one winding with a 9 volt
battery. It was actually a fairly fat and impressive arc. The
transformer
was eventually confiscated. Boo.

Those old mains derived EHT transformers were probably even more lethal
than
a MO transformer.

For a B&W TV, 6 - 7kV was about average - not sure whether any CTV ever
had
mains derived EHT.

It was some sort of large gooped up with tar EI core thingy with one super
high inductance winding. I still have no idea how it worked in a
television. If they made 6-7kv was there then some sort of diode and cap
multiplier to run the CRT?

AFAIK it was just half-wave rectified, the peak value whatever that was,
ended up at the final anode.

Its a bit surprising when you think that generally, CRTs were long narrow
defection jobs - some early homebrew sets had electrostatic deflection,
maybe a few commercially produced sets too.

Is this why tubes like in oscilloscopes, which are electrocstatic are so
long for their screen size? My current scope doesn't have the hump in the
back for the end of the tube, but I suspect it's a normal CRT with a yoke
and coils as well, since it's really just a small computer monitor.