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sc504 Ghost Images

 

Greetings,

I have 2 SC504 scopes. I have done a lot of restoration work on both these units. They are both working now, but I am not satisfied with the trace having ghost. Please take a look at the photo I posted some days ago. At that time I had 1 SC504, since then I have bought another one. BOTH of these scopes display EXACTLY the same ghost trace.

When I bought the second SC504 I thought I would have the chance to swap out the CRTs.

/g/TekScopes/photo/300558/3883505?p=Created%2C%2C%2C20%2C2%2C0%2C0

Thanks for the responses.

Barrr
 

Intensity is way too high IMHO, which is why you get that problem.

If OTOH you don't want your SC504s and are in the UK ...

D.

-----Original Message-----
From: [email protected] <[email protected]> On Behalf Of Barry Breaux
Sent: 02 April 2025 15:13
To: [email protected]
Subject: [TekScopes] sc504 Ghost Images

Greetings,

I have 2 SC504 scopes. I have done a lot of restoration work on both these units. They are both working now, but I am not satisfied with the trace having ghost. Please take a look at the photo I posted some days ago. At that time I had 1 SC504, since then I have bought another one. BOTH of these scopes display EXACTLY the same ghost trace.

When I bought the second SC504 I thought I would have the chance to swap out the CRTs.

/g/TekScopes/photo/300558/3883505?p=Created%2C%2C%2C20%2C2%2C0%2C0

Thanks for the responses.

Barrr
 

Ghost is normal at higher intensity, internal CRT phosphor beam reflection ?

One scope is missing a knob, on focus, inten, suggest you fix that it may be set too high

J
 

Jean-Paul, David,

Thanks for your responses!

OK, straight up. I have 5ct SC502's, 4ct SC503s and 2ct SC504s. This problem is unique to the SC504s. Yes, if I turn up the intensity the ghosting gets worse. If I turn down the intensity the ghosting get better, but the range that is satisfactory is very, very, very small and hard to stay in that range. There is something wrong.

David, I am in the US.

Barry
 

internal CRT phosphor beam reflection ?

My money’s on scan expansion mesh (to increase deflection sensitivity) artefacts.

Raymond
 

Raymond! YES I mewant CRT expansion mesh, the SC504 have it bad, due to CRT geom, the SC501/2/3 do NOT

Cheers


Jon
 

Jean-Paul and Raymond,

Is there anything that can be done to improve this behavior? I was thinking that reducing the sensitivity of the intensity adjustment might help.

Thoughts?

Barry

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