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Author Topic: Scope repair question - tek 454  (Read 3950 times)
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w9jsw
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« on: December 10, 2020, 07:00:14 AM »
Has anyone ever changed the graticule lamps on a Tektronics 454 scope? Mine is completely dark. I get a great clean trace but have a hard time measuring with it. This is a second hand scope that came this way to me. Looking at pics on the Tekwiki it looks like there is some sort of back light that should be there.

I love the scope and it does what I need it to do so no need to upgrade. Everything else works just fine.

John

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WA2SQQ
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« Reply #1 on: December 10, 2020, 04:20:25 PM »
W2AEW runs a YouTube channel, and he works for Tektronix. Reach out to him.
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w9jsw
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« Reply #2 on: December 10, 2020, 05:32:58 PM »
Think I got it sorted out. Couple of lamps on each side of the CRT at the top. Should be easy to replace. Found a source for the lamps.

Thanks guys!

John
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w9jsw
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« Reply #3 on: December 11, 2020, 04:57:42 PM »
Ran into this blog researching parts.

http://readingjimwilliams.blogspot.com/2012/02/vintage-scopes-are-better-part-1.html

http://readingjimwilliams.blogspot.com/2011/07/scope-sunday-3.html

I especially liked this one as I am a 35 yr retired IBMer... These scopes were all over the raised floor on the big data centers I visited as a kid. I actually cut my teeth on 370 storage channel micro-coding. (assy lang)

Parts source for old Tek scopes -  https://www.smcelectronics.com/tekpart.htm
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W3SLK
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« Reply #4 on: December 11, 2020, 09:01:56 PM »
When I was at NASA Langley, I worked on a lot of Tektronix equipment. They were the best manuals in the industry. Check your tech manual. They were obviously put together by a military person because they are in order the same way. A good 454 is pretty much bullet proof and was the standard analog scope until the 'sample/hold'  scopes came around.
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Mike(y)/W3SLK
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MikeKE0ZUinkcmo
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« Reply #5 on: December 13, 2020, 10:12:56 PM »
I've had a 454 for fifteen years, Paid 47 bucks for it, delivered.   It was INOP and the only thing I've ever done to it was reconnect a wire on one of the deflection plates after unpacking, maybe ten minutes.   Best 47 bucks I ever spent. Wink

My screen is dark as well, so thats going to be my next little project.   
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Mike KE0ZU

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w8khk
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« Reply #6 on: December 13, 2020, 10:17:45 PM »
Quote from: W3SLK on December 11, 2020, 09:01:56 PM
When I was at NASA Langley, I worked on a lot of Tektronix equipment. They were the best manuals in the industry. Check your tech manual.

Do you remember the race cars drawn on the sweep circuit schematic for the 545 series scopes?  That was a hoot!

* TektronixRacingTeam.JPG (47.69 KB, 861x552 - viewed 275 times.)
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Rick / W8KHK  ex WB2HKX, WB4GNR
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« Reply #7 on: December 13, 2020, 11:55:36 PM »
Wow, a lot of flat topping on that waveform  Grin
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w9jsw
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« Reply #8 on: December 14, 2020, 12:37:51 AM »
Yea, that was when one fuse blew on the gfz board. We then decided that no fuses were a better idea.
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