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Honestly, that is what I find in about 80% of the repairs I do. A single poorly sourced capacitor wrecked all orderly operation. My favorite is the bootstrap capacitor, which is invariably some cheap

The ripple on the -5V looked really quite high ...

Hi Roger, Thanks for all the ideas. I am a bit careful with voltages over 1 KV, but in the past, when I was still at school, I caught a belt at 2 KV on a homebrew scope that I was trying to build.

Apologies - I skipped the very important 'check all the low voltage DC supplies', there are so many inter-dependencies in these scopes. Roger

Colin, The voltage on the 'collector' together with the voltage on the front mesh of the storage tube depend on a +600V supply derived from a separate winding on the HV transformer. So the lack of

Not very good at finding things on schematics but I'm fairly sure that the funky looking capacitor is A27C321 I'll have to look through my stuff and see if I have a spare of a decent value on hand.

Interesting dead bug looking patch in the last picture John

My "new to me" TWD120 arrived today. Thank you Charlie. As Charlie advised in previous email, it did not pass self test, leaving the front panel LED unmistakably solid red. However, the repurposed IBM

https://www.kijiji.ca/v-general-electronics/calgary/oscilloscope-tektronix-antique-type-535a/1525295543 guess lockdown has made some people a bit silly.

If you are in the environs of Calgary, or just plain rich, and intent on getting a 535.... there's one for sale there, for just 3,000 CDN. And the ad says, it comes with a cart that tilts too! What a

I am looking for a front "clip-on" cover for a Tek2225 but they seem as rare as hens teeth - but it occurred to me that a cover from another scope in the 22xx range may fit. Can anyone suggest a

I have had some further observations, not good, I'm afraid. I thought that I would leave the scope in "store" mode and see if any improvement happened. It didn't. When I powered down, left it a while

Hi Gary, The very first thing you need to do is to measure the low voltage test points for DC level and ripple. They are marked on the board. These scopes usually have bad electrolytic capacitors and

Note: this post was initially posted to Tekscopes2. That post has been deleted.

Thanks Shailendra, Cleaning the pots will be the first thing i do when i open it up again. My go-to is Deoxit-5.

Hi, How on earth did they lose the package? Szabolcs Martin Whybrow <martin@...> ezt írta (id?pont: 2020. szept. 22., K, 10:49):

I have faced a similar problem on my 465B. In my case, horizontal sweep used to shrink and expand at random. There was no linearity issue, as calibrator square wave looked uniform across the width of

A fairly robust way of buffering would use a fast PNP transistor and a fast NPN transistor with the bases connected together and the emitters connected together; PNP collector goes to the Vcc supply;

In my ecstasy about the successful revival of my TDS3014B's Ethernet interface using the procedure described above, I forgot to thank those who helped me. Thanks! Raymond

Hi Gary: See, http://w140.com/tekwiki/wiki/465 to download Tektronix's superb and easy to follow (compared to the stuff we get today.) There is a lot of info on the Web about this very popular