Ok here's an update,

I did rewind the coil (ref# LX3201) and while I did,
I measured the length of the wire and compared it to
the length of the wire on the older
Zenith coil p/n# 20-4284-01, and determined that
if you add 7-9 turns to it, it should work as a replacement
for the coil on the 9-1270 board.
Sorry I can't say
the part no# for the coil on the 9-1270 board as the top
of the part with the p/n# is missing.

Anyway, interestingly enough, the rewound origional coil
measured .39mh which was darn close to the 20-4284-01
coil which has approximately 8 less turns wich weighed in at
..38mh. Not surprising since I wound it rather imperfectly
by hand.

Ok, so then I added 8 turns to the 20-4284-01 and
measured it. It measured .48 mh which I'm guessing is
probably what a new coil for the 9-1270 board should
read.

Ok, the results? I put the 20-4284 coil with the additional
8 windings @ .48mh, in the set. The set now works better,
but still not quite right. The coil and the pincushion xstr
both run hot, but possibly acceptably hot. I just don't know.
Uncomfortable to the touch, but not boiling water.
Antone know? Is it the norm for these parts to run fairly
hot in these sets?

Before I reworked the coil, the set would work, but
shut down during bright scenes. Seems to be
overcurrent protect.

Now with the coil reworked, it still shuts down on
some really bright scenes, but it has a very much
obvious improvement in tolerance. In fact it might
run for 15 minutes or more.

I guess I'm going to have to get the schematic on this
one.

Oh, one thing I forgot to mention was,
I replaced the Flyback origionally. I ordered the
part from http://www.slelectronics.net/fl.zenith.htm#

I ordered the origional part p/n# 95-4134-28
and they sent me a 95-4134-11 which they claim
is a valid sub. The part had both numbers on it
and appears to be aftermarket.

I ordered a different flyback from them for a
Zenith PTV awhile back, and it worked just fine,
but they didn't give me a sub in that case.

Anyone have any opinions about whether this supposedly
valid sub could be the problem with this set?

Also.FWIW, I checked out the brightness limiter circuit,
best I could without a schema that is, and it seems to be ok.

Don't mean to go on so, basically I'm just speaking to the
archives here, which is why, as you may have noticed,
I put so many model and board numbers in the title.

Ok thanks.
=^^=DM



"Dave Moore" wrote in message
...
Hello folks.
I came across this article by the great Dave D., about
rewinding these coils, ref.# LX3201

http://groups.google.com/groups?hl=e...6C.A54D88A9%40
locl.net

Being faced with this problem, I have decided to rewind rather than wait.
However, I have a few coils from older Zenith boards that I could just add
a few turns to.

Only, to do this, I need to know the inductance value to shoot for.

Anyone know what the value of this coil is supposed to be?

Thanks
=^^= DM