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Tek 465B blurry CRT.

Jordan Kersten
 

My 465b won't focus quite as clear as it should. Doesn't matter where I adjust the focus or astig control. It looks like there is a ghost image of whatever I am measuring. So the trace/waveform becomes larger/wider than it should. I don't think it is physical damage inside the CRT because the "out of focus" is uniform and does not change at all when you change the trace position.

~Jordan~
Dino Papas
 

Take a look at:



where there are procedures that try to address this problem for both
the 465 and 475 scopes.

When I had a 475 I did this procedure and it helped a little but did
not solve the problem....graduated to a 2440A, but I do miss the nice
sharp trace of an good analog scope!

Dino KL0S

On 1Oct2008, at 6:39 PM, Jordan Kersten wrote:

My 465b won't focus quite as clear as it should. Doesn't matter
where I adjust the focus or astig control. It looks like there is a
ghost image of whatever I am measuring. So the trace/waveform
becomes larger/wider than it should. I don't think it is physical
damage inside the CRT because the "out of focus" is uniform and
does not change at all when you change the trace position.

~Jordan~
Bernice Loui
 

Hello,

There was also an entire batch/lot of problem 465B crts from back in the day. One of the problems was spot size and ability to focus. Many were replaced under warranty by Tek.

I remember looking a quite a few 465Bs with this problem at a local cal lab.


Bernice



~~~~~~~~~~~~~~~~~~

--- On Wed, 10/1/08, Jordan Kersten <jordankersten@...> wrote:
From: Jordan Kersten <jordankersten@...>
Subject: [TekScopes] Tek 465B blurry CRT.
To: TekScopes@...
Date: Wednesday, October 1, 2008, 10:39 PM

My 465b won't focus quite as clear as it should. Doesn't matter where I adjust the focus or astig control. It looks like there is a ghost image of whatever I am measuring. So the trace/waveform becomes larger/wider than it should. I don't think it is physical damage inside the CRT because the "out of focus" is uniform and does not change at all when you change the trace position.


~Jordan~

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