Thank Chuck Harris I checked the tracks where the negatives seem to be going well, the tensions would all be there and the only problem is the one exposed in the previous message Roberto

Hi, I am a retired electrical engineer having designed electronic equipment for measurements in oil wells for over 30 years. About 40 years ago I picked up a 547 scope with an 1A1 plug in left as

Hello Neill, I'm new to this group in writing. Reading allready for a long time. I'm in the Netherlands. As I have been reading here on the Tek forum (Chuck Harris and perhaps others too), the

Or maybe SF6 (nasty) gas which is used in HV בתאריך יום ב׳, 17 בפבר׳ 2020, 10:22, מאת Yeun-Jung Wu ‏< B0190@...>:

Hi folks, While putting a TDS7xx back together, I required several new feet, so I modeled some. Files ready to print are

The vertical module I offered earlier, for the 475, has been claimed. Thanks much. -- --- Bruce Lane, ARS KC7GR http://www.bluefeathertech.com kyrrin (at) bluefeathertech dot com "Quando Omni

Thanks, Renee, but it ended up going to another fellow who has a broken 'scope he's trying to fix. Best of the week to you. -- --- Bruce Lane, ARS KC7GR http://www.bluefeathertech.com kyrrin (at)

Thanks! I checked again and it turns out I missed a second screw on the top left that attaches to the preregulator board. So there are 7 screws in total.

Victor, Before accusing the HV transformer ... some remarks. How "very low" was HV at the test point? Is the oscillator amplitude at Q1430 also (in ratio) very low? What voltage did you have at

If I understand correctly, the 454 HV is similar to the 453. I successfully rewound a 453 transformer using a low-tech process which I documented in topic and photo album titled "453 HV Transformer

I had to make the same choice when I moved cross-country in 2017. I chose to keep the 7904A because it has the kickstand and the 7904 does not. Having worked on both, I decided that the kickstand

Title says it all. I have multiple (MULTIPLE!) Tek mainframes and I'm hoping to cull the herd this year. I want to keep one 500MHz scope and it's either the 7904 or 7904A. What are the advantages

You're welcome.  I don't know if you have the particular HV transformer, but as Chuck (next) says, you're definitely looking at a low high voltage, so the question, of course, is why.... For the

Because you don't get a lot of room to route the heavy traces needed in a power supply, with a two layer circuit board, designers very often used cheats, like using the fact that all of the negative

When the Anode voltage on the CRT is lower than it is supposed to be, the electrons in the beam travel proportionately slower than they should. Because they are slower, they spend a longer amount of

hello everyone after changing the electrolytic capacitors on my teak 475 I have a problem that turned on after a few minutes it turns off I checked that the transistor Q1446 2n2222 was defective due

Hello Harvey: Thank you for your hint on future diagnosis. I will start collecting more information on epoxy coated transformer first. 5D10 seemed to work fine except read out information had been

About the middle of the page: https://www.estatesales.net/CA/Rocklin/95677/2475516 No connection, but is in a neighboring town. That 7904A looks like it has 7S12 in it with modules Bob

Hi Leonard, I replied to you minutes after your first request, and the same after your second request. But your spam filter obviously doesn't like me. I suggest you check your spam folder. Here is

Hi Bruce- I use the 475  as my preferred scope...so If it is still available...I will take it. we should do this off list from here ....k6fsb dot 1 at the gmail place Renée