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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:
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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 |
Bernice Loui
Hello,
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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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