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Dear Barry Suggest you read the excellent Tektronix Circuit Concept book on oscilloscope CRTs, and learn about the development and characteristics of mesh dome CRT. Then follow the service manual on

I have a bit more info. I started the scope up again and I got the initial interrupt error that I posted in the beginning of this thread. When I shut it off and started it back up, I was able to read

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

Hello, For all those of you new to customs - in Europe we had it for 20 years. Small video is at <https://youtu.be/XCgWlNomEgo?feature=shared> which should answer some questions. Tam -- With best

Noise may be HV corona j

Dear Menecham: Very timely note, suggest to repost on Tekscopes2 and BUY/SELL forums. Perhaps also EEVblog? We have seen congress in US proposing removing the deminimus exemption. The entire

Alright, so I'm not in the clear with this 2247A. I've been busy with other things and had the scope off for about 3 days. Turned it on this morning and noticed the trace was a little noisy without a

I have a sleepy-eye assembly, switch attached to cable, if interested. I got it from the Tek Country Store (Tek salvage and surplus). It appears to be unused. Photographs at

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

I've had a couple of enquiries from US members here, requesting clarity on the new Customs Duties - which may or may not be applicable on my 24xx series Tekscope kits, which are shipped from here in

According to Findchips.com, Quest Components has VN1316

Thanks to all that have posted - it looks like I'm just going to find the time to open it up and start diagnosing. My feeling, and that that seems to be the opinion here as well, is that the fault

These parts are being operated in their linear region, so Rds(on) isn't relevant. As long as they can take the heat, what we need is agility, that is, minimal

internal CRT phosphor beam reflection ? My money’s on scan expansion mesh (to increase deflection sensitivity) artefacts. Raymond

[email protected]> wrote: I'm not sure, and I'm not sure that it's going to matter until you're at least elbows deep, at which point you'll know which SM you need. Note that this scope may not

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

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

Yes-- they have no heatsinks and are spec'd at 3W max in the TO-39 can. The left plate pair gets so hot I can't touch it but I realize that's not a calibrated measurement. There are also VP0120 and

If I had a 2245 with your problem I'd be looking for... Hmm. Your parts are running naked, right - no heat sink? That's maybe 1W. An eBay seller has TO-92 VP0116 $15 for 10, glue on a copper fin.

[email protected]> wrote: Yeah, you may well be right. Aside from the power supplies and U800, I can't think of much that's common to the OSD and traces in the horizontal. Personally I like to look