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Old 20th Nov 2022, 3:23 pm   #1
Join Date: Jul 2010
Location: Nottingham, Nottinghamshire, UK.
Posts: 207
Default Tektronix 465B (Early)

I was recently given a very tired Tektronix 465B oscilloscope that was in need of some TLC. It basically worked in that there was a trace on the screen that could be controlled by the usual ‘shift’ controls, but there was some ‘Z’ modulation on the trace and some fold-over or re-trace problems. There was also several years of accumulated dirt that would need to be removed, but that was minor.
A check on the voltage rails showed something was not right with the unregulated 110 volt line and this was traced to the two smoothing capacitors C4439 and C4429 which I now understand are known for causing problems.
Much to my surprise, after I replaced the two capacitors and adjusted the 55volt rail (which is used as the reference for the other rails) the oscilloscope worked very well with no sign of the previously noted faults, even the calibration did not need adjusting.
On advice from a friend I changed the two bridge rectifiers (which are apparently slightly under-rated,) and a tantalum electrolytic (C4006 47μ 35V) that decouples the supply to the E.H.T. generator.
Now turning to the aesthetics, the front panel and controls were cleaned with warm water with just a touch of soap, and applied using an old toothbrush and plenty of kitchen paper towel , taking care not to get the front too wet. The handle and rear plastic fixing was cleaned with carpet cleaning moose and with a little help from the toothbrush, the dirt just fell away. The metal case was in a bad way with lots of scraps, scratches and a few dents. I decided a full strip and re-spray would be the best way forward. A trawl through the forum resulted in a post from Craig Sawyers in which he mentions a company called Paints4U who were able to supply paint matched from a sample previously supplied by Craig. I contacted Paints4U who, after some digging into their archives, found the formula and supplied a spray can of ‘Tektronix Blue’ Paint.
To remove the old paint, the case was treated with a proprietary paint stripper, cleaned, de-greased and then sprayed witha coat of acid-etch white primer. The following day I sprayed the case with the ‘Tektronix blue’ (two coats) then left the case in a warm place to dry before re-assembly. My Son kindly 3D ’printed’ a set of rear feet which finished the job nicely.
In general, I am very pleased with the result. I think the scope has been dropped at some time in its history as the front casting is slightly bent, but it doesn’t affect the operation of the scope so I can live with that.
If anyone would like to ‘freshen up’ their Tektronix equipment, Paints4U can supply the paint in spray cans which can be ordered on-line (mine came the next day). If a contact there is needed, Josh knows all about it.
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Last edited by G8vsjDave; 20th Nov 2022 at 3:29 pm.
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Old 20th Nov 2022, 8:22 pm   #2
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Join Date: Jan 2009
Location: Falmouth, Cornwall, UK.
Posts: 1,962
Default Re: Tektronix 465B (Early)

What a good technical writeup, the case looks fantastic, well done.
_________"It`s only an old telly" ___
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Old 20th Nov 2022, 8:45 pm   #3
Cruisin Marine
Join Date: Jul 2018
Location: Worthing, West Sussex, UK.
Posts: 915
Default Re: Tektronix 465B (Early)

What a grand restoration story that is- well done mate!
"Behind every crowd, there's a silver Moonshine"
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Old 20th Nov 2022, 10:00 pm   #4
Join Date: Aug 2010
Location: Malvern, Worcestershire, UK.
Posts: 325
Default Re: Tektronix 465B (Early)

Great finish and such a good match, thanks for letting us see the result and also for refreshing the mind of the supplier.
Quite amazing to consider the coverage obtained from a can. Also, a big thumbs up to Craig for supplying an original sample for the supplier to replicate.

Last edited by VT FUSE; 20th Nov 2022 at 10:12 pm.
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Old 21st Nov 2022, 6:10 pm   #5
The Philpott
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Join Date: Aug 2016
Location: Colchester, Essex, UK.
Posts: 4,021
Default Re: Tektronix 465B (Early)

It's impressive.

If it's Josh's day off when you make an enquiry, bear in mind that it may be in their system as Tektronic Blue (unless the name on the label was manually input on Dave's order!)

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