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Title: Scope repair question - tek 454 Post by: w9jsw 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 Title: Re: Scope repair question - tek 454 Post by: WA2SQQ on December 10, 2020, 04:20:25 PM W2AEW runs a YouTube channel, and he works for Tektronix. Reach out to him.
Title: Re: Scope repair question - tek 454 Post by: w9jsw 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 Title: Re: Scope repair question - tek 454 Post by: w9jsw 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 Title: Re: Scope repair question - tek 454 Post by: 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. 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.
Title: Re: Scope repair question - tek 454 Post by: MikeKE0ZUinkcmo 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. ;)
My screen is dark as well, so thats going to be my next little project. Title: Re: Scope repair question - tek 454 Post by: w8khk on December 13, 2020, 10:17:45 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! Title: Re: Scope repair question - tek 454 Post by: steve_qix on December 13, 2020, 11:55:36 PM Wow, a lot of flat topping on that waveform ;D
Title: Re: Scope repair question - tek 454 Post by: w9jsw 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. AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
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