Wait'll he sees what's waiting for him at his local PO... ![Evil >:D](https://www.eevblog.com/forum/Smileys/default/xevil.gif.pagespeed.ic.tdrs7Uj5gu.png)
Yup, I got it! The exterior box was pretty banged up, but the inner layer(s) were pristine. Thank you, mnem! Also, the 3DP cover is very cool. ![ThumbsUp :-+](https://www.eevblog.com/forum/Smileys/default/icon_smile_thumbsup.gif.pagespeed.ce._JElyJQqdB.gif)
Now, I need to find a cozy spot for it and get some probes that won't suffocate it. Then, I can start re-learning how to use an analog scope. ![Azn ^-^](https://www.eevblog.com/forum/Smileys/default/azn.gif.pagespeed.ce.7t5xC2ZH_H.gif)
So, mnem, what is the ubiquitous intermittent HV fault that you mentioned in https://www.eevblog.com/forum/testgear/test-equipment-anonymous-(tea)-group-therapy-thread/msg1528642/#msg1528642 (almost a year ago)?
IIRC (this was quite some while back; when it was my only working 'scope) I brought it up in the Anatek forums and was told this was a common failure mode; the carbon composite resistors in the HV would shift value and cause excessive loading in the caps, eventually breaking them down. This requires a rebuild of the resistor array and replacing HV caps in the HV doubler, as well as sometimes the resistors and pot in the grid bias circuit. Plus of course the usual seek & destroy of leaking electrolytics throughout. I think this one predated tants but probably had a few suspect jelly-roll caps; not positive though.
Supposedly,
the same fault was common in the 453 as well, but as it used hybrid hollow-state/solid-state rectification, it only caused the screen to collapse rather than intermittently blowing fuses like the all solid-state 454.
The problem is... I'm not positive as I never actually fixed the thing. I just kept replacing fuses every once in a while until I got my 2465 back online... then I kept the 454 as a backup until I got my EX-NASA 2465. When I rebuilt my 2230, the 454 pretty much went in the closet never to return to active duty.
![Embarrassed :-[](https://www.eevblog.com/forum/Smileys/default/xembarrassed.gif.pagespeed.ic.zcm3EmNu9T.png)
I've been searching and searching and I can't find any of that older stuff... I'm sure there's oodles of discussion on it in alt.sci.repair too, but I long ago fell out the habit and no longer even know of a working portal with access since the Purge of '08.
Manual with schematics is here:
http://bama.edebris.com/download/tek/454/tek%20454.pdf
I'm glad you got it in one piece; that was why I decided to print up a cover for it. I literally spent half a day trying to think of a way I could reasonably expect it to make it all the way there without one or more delicate knobs getting effed up... in the end I realized there was no other way.
![](https://www.eevblog.com/forum/testgear/test-equipment-anonymous-(tea)-group-therapy-thread/?action=dlattach;attach=714882;image)
So I spent another afternoon designing it, and then had some issues with my printer not liking the Gcode and randomly trying to print the damned thing at like 60% scale one time and then 100% the next... And THEN it FINALLY printed successfully... and I put it on the floor and STOOD ON IT with all my 300 lbs.
![Scared :scared:](https://www.eevblog.com/forum/Smileys/default/scared.gif.pagespeed.ce.oZptHNcbsD.gif)
And it HELD. :
![ThumbsUp :-+](https://www.eevblog.com/forum/Smileys/default/icon_smile_thumbsup.gif.pagespeed.ce._JElyJQqdB.gif)
So once I touched up the inside corners with a heat gun to get a moderate press-fit on the 454's outer bezel, I declared success and took a few victory pics, and it was time to pack up my old beast...
![Embarrassed :-[](https://www.eevblog.com/forum/Smileys/default/xembarrassed.gif.pagespeed.ic.zcm3EmNu9T.png)
After med's tale of a Euckered CRT spooked me; for all you naysayers, I not only DOUBLE-BOXED it... with layers of bubble-wrap and a whole year's worth of accumulated Amazon bubble-mailers... I TRIPLE-BOXED it.
MAXIM 37: "There is no 'overkill.' There is only 'open fire' and 'I need to reload'... this into yet another box." ![Laughing :-DD](https://www.eevblog.com/forum/Smileys/default/smiley_laughing.gif.pagespeed.ce._hfWAz_QHO.gif)
You all have NO IDEA how hard it was for me NOT to plaster the thread with all these pics, as I checked in on it over a day and a half:
1) A good start...
2) Good inner face and walls...
3) Almost...
4) Done! Now... to wait an hour for it to cool completely so I don't rip its face off trying to separate it... EFF THAT!!! Turn the ceiling fan on high and crank the AC down to 67°F!!! 30 minutes of snap, crackle, pop later... it jumped off by itself right into my hot little hands!
![Evil >:D](https://www.eevblog.com/forum/Smileys/default/xevil.gif.pagespeed.ic.tdrs7Uj5gu.png)
5) I totally eyeball-measured the location of this slot for the latch-catch... I got it pretty close. But the depth I deliberately got just right so you COULD add spring-steel hooks to snap onto these catches.
![ThumbsUp :-+](https://www.eevblog.com/forum/Smileys/default/icon_smile_thumbsup.gif.pagespeed.ce._JElyJQqdB.gif)
6) However, I did NOT make allowances for the rubber feet that belong here. That didn't even dawn on me until it was halfway through the print.
![Face Palm :palm:](https://www.eevblog.com/forum/Smileys/default/xfacepalm.gif.pagespeed.ic.EBDwh1hCfo.png)
I still don't care; I'm dead-chuffed with the results, because:
7) MONEY SHOT!!!
![Clapping :clap:](https://www.eevblog.com/forum/Smileys/default/clap.gif)
mnem
Thank you for giving this beast a good home; may you both live long and prosper!
![ThumbsUp :-+](https://www.eevblog.com/forum/Smileys/default/icon_smile_thumbsup.gif.pagespeed.ce._JElyJQqdB.gif)