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@ Arie de Muijnck As bouncing is typically short (~ .5 ... 1 ms) following mechanical action we are talking about 100 pF...1 nF; under 5 V this means .5 to 5 nC which is very low. If you read me well

Yes, it is stored in mechanical form! Who said storage needed to be digital or tape (paper or mylar)? Hidden Figures is great, even though there are some location errors in it.? Only we who grew up

Don;t do that. Placing a filter cap _directly_ over a contact will cause big discharge currents and will damage the contact. Always use a resistor in between to limit the current. Arie

I also see it on some insulated wire, but not on all the wire. Since it is so selective, I still think the mold theory is best. I looked at it on a 10x magnifier and still cant tell what the heck

When rotating Vert, Horiz and Step/Offset front panel knobs large unexpected jumps in settings occur. Gray encoders S210-220-230 are unobtainum. Unsoldered the culprits, unmounted the sealed blue

It took me some time to find out, as the service manual does not explicit what the "drawer" is. It appears this is the lower part of the tracer, under the display and upper front panel. It's a slider

RE SC502 CRT HV Blanking : likely suspects: High meg resistors in HV PS, Focus/inten Scratchy pots focus, astig, inten Easy to try that first. Jon

Thank you for the informative video Bob. Efforts like that make it more practical to keep these wonderful old instruments going for a while longer. The magic smoke came out of my SC503, going to

I have seen these on my capacitors too. I do not think this is mold. I asked around on other forums, and the unanimous answer was the plastic around the cap degrading. Sort of like the fat that comes

Hi, I am selling my Tektronix 7613. The scope works perfectly fine. I have uploaded some photos to imgur. The 7613 itself has some missing parts, which inlide the plastic bezel, and metal blue

In trying to clean things up I delete the wrong message. Here's the correct video link: https://youtu.be/fzf-Ps0GP3U -- Bob Haas

Barry, The d-c restorer diodes are on the high voltage board, A5 page <8> in the manual. The 1mfd condensers are on boards A1 and A2. All of this is on page 156-157 when looking at the PDF of the

I would like to thank Bob for the video! So, thank you Bob! Well done! I am replacing the following on the A1/A5 board related to the HV supply: C850, C851, C881, C882, C883, C885, C887, R888

Here is the video: https://youtu.be/orV2HX5YL5E -- Bob Haas

Bob, Which tantalums are you having to replace under the A5 board? Barry

Bob, Looking forward to the video! Thanks! Those capacitors are actually on the A5 Aux board. I had that board out for cleaning and inspection. I did not check the capacitor values. I've been

The DC Restorer caps are C881, 2, 3, 5 and 7. They go between the main (A1) board and the HV auxiliary (A5) board. In my experience, they are more likely the problem than the diodes on the A5 board.

CR884 and CR885, they are on A5 board. Regards, Ignacio -- Este correo electrónico ha sido analizado e

When I get the vertical amplifier's damaged IC replaced (and the problem is still there), I'll add a picture in the group page. Thanks, Barry - N4BUQ

Hi Barry, Is there a picture of how the distorted characters look like? Ozan