Re: TECH: fun with Yokes


jrok wrote:
or a yoke like no other...

So as a fun project and experiment, I decided to try and make an XY yoke :)

This was the theory, use an old 19" Happ KP-1915 as a starting point
and use an Amplifone yoke as a template. Then it's off to yoke winding
land...

I kept the Horizontal yoke intact, except change the wiring to the
connection board so it matched the amplifone yoke, ie. one side started
winding at the top and finished at the bottom, the other side started at
the bottom and finished at the top. This I wired top A & bottom B and
Top B to bottom A. If that makes sense.

Next, cut all the wiring off the vertical yoke, which looked like several
hundred windings of 30awg coated copper, and get all the damn glue/resin
off the ferrite yoke formers. Anyone know exactly what glue or resin
they use for this ?

Time to rewind the sucket. The Amp looked to be using 23awg, course couldn't
find any of that gauge, so I settled for 24awg and figured I would add a few
extra windings based on the difference in surface area.

This former is smaller than the Amp and ended up only managing to get 92
windings per side. Once finished it has a resistance of 1.2ohm, inductance
roughly calculated to 2mH, but that is only an approximation.

Next it's put the yoke back, hack up the HV of the monitor a little and
use an original amplifone deflection board... oooooohhh.. what will happen...

First pics of the test setup and results are at
http://www.jrok.com/xfer/xystuff/

- James


--
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JrokLand http://www.jrok.com
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Nice work! Setting convergence on X-Y tubes always seemed easier to me.
Everything's made up of lines, making it easier to spot a mismatch.

.

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