6 Oct
2001
6 Oct
'01
1:14 p.m.
Hi Michael, welcome to the list! I hope it proves as useful to you as it
has to me (so far) - I only hope I can be as useful myself someday...
At 23:15 06/10/2001, you wrote:
Tha most probable cause is indeed the transformer, more
precisely: the
aging core
of the transformer. This core usually is made of a lot of thin sheets of
steel.
[snip excellent description - and yes, eddies is correct]
Now, this is the point: With old transformers, this
insulation starts to
literally crumble
away, which leads to a significantly larger stray magnetic field around
the transformer.
I can see how this could be the case. for instance, I can't believe that
Commodore would have let the units out of the door 20 years ago with as
much screen wobble as is present in mine. In fact - I know they didn't, as
about 10 years ago I used an 8032-SK for quite some time, and that
definitely didn't wobble.
Shielding of the old transformer is no real option. You
would need what
we Germans
call "mu-Metal", which is a special alloy of steel and other things i
have long
forgotten but that make it EXPENSIVE.
It is magnetic, but not a good conductor, which make it ideal for
shielding magnetic
fields.
Oh, I don't know. I can probably get hold of some for relatively little
money (beer tokens, if that).
You could try a shielding out of steel sheets, but they
might get hot if
the stray
currents induced by the transformers magnetic field are too large. And
the shielding
effect is not too good...
I may give something like that a whirl, just to check it is the problem.
I'll also be having a poke around to make sure it's not being unnecessarily
amplified by a component failure. And the caps are still on the list... :)
When I've finished this one, I've got two more to do.... AND there's
another 8032 to breath life back into (that one is more seriously broken).
I can see I'm not going to have much time left over to do my motor
racing.... :)
I live somewhere in southern Germany, which is not that
bad. No,
really.... 8-)
Well, it's got to be warmer and drier than the UK....
--
Cheers, Ade.
Be where it's at, B-Racing!
http://b-racing.co.uk