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Hi David, I'm so very sorry to hear about your trouble. Believe it or not, I had a very similar experience with acquiring my 575. If it is any consolation, I paid EXTRA to have mine "professionally"

I did that. It goes away for a short time, then comes back.

Thanks for the further clarification. It is very very helpful. According to the document at http://skory.gylcomp.hu/alkatresz/tl494app.pdf the error amplifier has frequency response plot in Figure 13,

I've found the fan frame & autotransformer, still looking for the 0.8A Circuit Breaker & feet. Thanks!

David, If you bought this through eBay, I would file for a refund. Put it back in the box and send it back. You're better off finding another one in good condition rather than say, accepting a partial

David, So sorry to hear about your Tektronix 576. Reminds me of my Tektronix 531A situation a few years ago. Seller wrapped the scope with 1 layer of bubble wrap and then wrapped it with cardboard

Yeah I'm pretty sold on a 576 being the best thing for my needs, but this has sure made it difficult. With the time difference added on top I haven't even been able to discuss my options with the

I have gotten on shipped like this as well. It boggles the mind. The CRT of the 576 is unique unfortunately. I have 2 here in stock but both of them are waiting on a rejuvenation experiment. Both

Yeah it's not looking good at this point! It'd be stupid enough if the seller had no idea, but I SPECIFICALLY told him about the CRT thing and asked him to put adequate shock absorption around it, so

I winced upon reading your description of how stupidly it was packed. That crt is physically unusual (10x10, instead of, say, 8x10), which is why it's unobtainium. Electrically, though, it's plain

Following on from my other thread where I was awaiting delivery... ... my 576 arrived today. As soon as I popped the lid on the crate I knew things were bad- there was zero padding between the crate

Well, looks like I'll need an external display sooner rather than later... my 576 just arrived with a smashed screen.

Run the exerciser 03 routine.? See the manual. Regards -- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus

I looked at your video and it is not similar. Mine is showing very regular dots all the way across the bottom of the screen. This usually means the scope is not calibrated.

--- That is what I guessed in my reply. U4 is wired for over voltage protection so it is OK it be be on/off. When over voltage at the primary happens it needs to turn off the switcher. U2 is the one

I got one of those pots from QService some years ago. EJP

Correction of typo: V2 and V4 should be U2 and U4, the error amplifiers.

@Jeff I can't remember exactly which rate I settled on, but yep, it did need to be bumped down a bit for the clearest image @zentronics "Disturb the measurement"? To an extent, sure. "Cause the unit

May be way off topic but I did have what could be a similar situation many years ago with what appeared to be dots on the screen trace. I did a quick utube video "2465B Trace Possible Z-Axis Issue",

Zen, I did make some progress with the 067-0521-00 Calibration Fixture on my 547 and need only remove a small dip or 'anti-bump,' if I may, in the first 10 nS of the top of the square wave. Otherwise,