Tektronix 2213 dim trace

You can look for the CRT bias adjustment, and see if there is able to be increased. But, if the scope has a lot of hours on it, the CRT is most likely weak.

If you look around, maybe you can find another one like yours that is a scrapper, but the CRT is good. Or, if the scope is worth it for you, you can call Tek to see if a new CRT is still available. They are however, fairly expensive to buy new, but much cheaper than a new scope.

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JANA _____

Thanks for reading, Steve

With the bias all the way up, it was still too dim. Thanks for the reply, that's what I figured.

Thanks again, Steve

But if the beam find function results in a bright trace, shouldn't that mean the CRT is fine?

--- sam | Sci.Electronics.Repair FAQ Mirror:

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Important: Anyth> You can look for the CRT bias adjustment, and see if there is able to be

Doesn't the beam finder function, sort of concentrate the beam to a small area on the screen, and thus less spread of the beam on the screen surface?

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JANA _____

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Important: Anyth> You can look for the CRT bias adjustment, and see if there is able to be

Sure, probably 1/2 in both X and Y. So, it would be much brighter. But I got the impression - perhaps not valid - that the appearance was normal for the beam finder but maybe he just meant the brightness was then adequate.

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Have you checked the resistors in the brightness and contrast circuits?

"Michael A. Terrell" wrote in news: snipped-for-privacy@earthlink.net:

Early 2213/15 scopes had a problem with a little too high CRT filament voltage,drastically shortening the CRT's life,so a "mandatory" mod was generated that removed one half-turn off the HV transformer filament winding.This "mandatory" mod meant that letters were sent out to known owners and any 2213/15 that cme into a TEK field office was modded and a mod sticker placed on the back.IIRC,the HV xfmr should have a -01 suffix if made -after- the mod came out. The sticker identifying a modded scope should say "M50226",and the serial number range was B010100 to B029389 ,and 200001-206198.

Sorry, I should have specified. I just meant the latter, that the brightness was just adequate. The Ser # is B021862, and there is no sticker or note on the back, besides what looks like a hand-written q.c. sticker, it says BES, S 6/28, I didn't open up the power supply cage so I don't know if the xformer has the -01 suffix. I would love to get this 'scope running if possible and not too expensive. My only other two are both on their last legs, a T935a and a 422. What about this one on ebay (item # 7510403355)? Does that screen problem look like a damaged CRT, or possibly something else? Thanks for all the great replies, I'd love to get this one back up again.

Steve

It's possible that the only problem is that one of the H-plate wires fell off, a power supply is bad, or some other circuit problem. I would not guess a bad CRT but the Tek experts here can be more definitive.

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Note: These links are hopefully temporary until we can sort out the excessive traffic on Repairfaq.org.

Important: Anything sent to the email address in the message header above is ignored unless my full name is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs.