"Meat Plow" wrote in message
...
On Wed, 28 Oct 2009 21:23:13 -0000, "Colin Trunt"
wrote:


"Meat Plow" wrote in message
...
On Wed, 28 Oct 2009 12:39:07 -0000, "Colin Trunt"
wrote:

OK so it was hissing, I see blue arcing on the tube on the cap,
is also covered in tobacco smoke/dirt. I tried some insulating tape
at first, which worked for a while but not the next day.
Anyway I cleaned up around the cap a bit untill I did not get much
arcing
or any arching.
Anyway now when I switch on the picture is blurred, however it gets
better
and after about 15 minutes it is back to normal or very near to.

So how do I make it work from cold, ie no blurred picture.
There was also some hissing this morning and some faint arching
but that seemed to clear up afer a few minutes.

I am thinking cleaning a larger area would help.

I am not sure why the picture eventually sorts it self out slowly
after switching on.

Is something heating up?


How was the focus when it was hissing? Often the focus reference is
part of the anode voltage circuit and could be strained by the
additional current when arcing.


Well generally bad, but when it first started hissing I think it was OK
it was just the noise which was annoying.
Only after my various attempts at cleaning where the arcing was coming
from
did the out of focus stuff start appearing.
There may still have been some arching then but less visable and more
silent.
What tends to happen is the picture slowly 'unblurs' itself, and the
hissing
if any goes
away.
I was king of thinking that cleaning an area disturbed the electrical
charastics of the
tube, unbalancing it, I though maybe if I cleaned all of the tube it might
restore
that balance as it would have an even spread of surface charastics.
However eventually it does restore focus fully even with an unevenly
cleaned
tube.

I am thinking maybe the surface 'dries out' or the surface charges up to
restore an
even 'balance'.
It is when it has been switch on after a long period off that it is
blurred.
If I switch it on an off now it remains unblurred because it has 'warmed
up'.


Incidently I have just started using an old cumputer monitor as a second
terminal
and I can hear it hissing!! High humitity is part of the problem I think.
The picture looks OK maybe a little blured hard to say, it's not very
bright
though.


I guess the only action I can take is to clean it throughly. I mean I have
no parts
or a soldering iron etc... so thats about all I can do anyway.

I wil try giving it a good clean when I have the time.

Thanks for your input.


Watch the anode hole on the CRT, it will store high voltage and will
shock you. Running a bead of silicone rubber around the outside of the
cap on the CRT surface can stop arcs if the surface of the CRT is
carbon etched from arcing.


Not sure if I have any silicone rubber or not, or indeed what it is :O)
I might have some plumbers white silicon stuff though.

I was wondering about the cap, as I had lifted it up, I was wondering
if I meeded to clean under it.

I saw the wires that go to the anode and I thought maybe I had disturbed the
position of the anode, but obviously not as that would not selfright itself.

The area I didn't clean look black but the clean are alooks pretty OK.

It's not a mojor problem though, I normally switch it on beforeI want to
watch it so by the time I do the picture is perfectly fine.

I was thinking of getting one of those new fangled flat screen
ones too. I could also do with a flatscreen as a second monitor.
When I used the old one I was reminded of how small the screen
is and how big and heavy the monitor itself actually is!!