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There is something going on with the +55V what I can't understand. After repair by Russ of (only) the +15V rail: Previously: I suppose that since 55.66 V is OK the low reading 46.9 V can only be due

Drats.. I'm in Arizona. Thank you for responding.

Where are you based? If in the UK I have a couple of 2215s that are free to a good home. One works but I suspect the focus resistor chain is off, the other has a PSU fault that someone (not me!) has

It would be interesting to take a look at the 1502C and see how it generates its pulse.

Actually,? it would be good to add that stuff at a central repository somewhere,? like TekWiki. I've noticed that the are already some references to some of the possible modifications on the TDS754

Thanks. I do have both, had to do a lot of swapping to get them running, mostly the HV boards and a horizontal amplifier. The 1503 puts out a half sine pulse generated by a transistor, it is much less

What would be nice is a summary and collection of all the mods for the TDS 5 6 and 7. Which ones can be upgraded easily xcetera

I'm on the prowl for a CRT to fit a 2215. I picked up two 2215's one had a broken CRT the tube was filled with glass (makes a pretty sound) the other has a very dim CRT. I was able to make a pretty

What about the somewhat newer TSD2000 and TDS3000 series? We had a lot of them at my previous job. They are not quite as fancy, but much smaller, lighter and responsive. They can have at least RS232

Hello Folks, need to advise on some things related to the TDS5xx series for buyers. First of all, only the D models can do GRADIENTED DPO - on classic InstaVu scopes, frequency information is

Good info Harvey! And the truth of it is that it's really good to have both a 1502 and a 1503. The 1503 was intended for looking at much longer distances and it quite useful for stuff like long runs

Jim, Did you manage to extract the GPIB card from the faulty SA? Thanks, Martin

To be fair, Joel Koltner has been dead, for years. He was a regular on news:sci.electronics.design and other electronics newsgroup for years prior to his death. Michael A. Terrell

If you don't mind outsourcing the repair, let me recommend Jay Walling: https://www.instagram.com/p/BkpHaVJgsZr/?utm_source=ig_share_sheet&igshid=1jpdh3tjkxm3v His display works perfectly in my

Many thanks George. I did wonder if the pattern might actually be due to velocity mod on the X-deflection, which is tantamount to the same thing. I'll investigate and report back. John

Yea I noticed that too. If you have to ask, it's too much. I'm not even prepared to put $230 into the TDS544A at this point, but thanks for the suggestion. ST <wyzkydd2358@...> wrote:

Joined this site a short while ago to get info for the 2215 scope my friend gave me. Got interested in other models and then decided it might be fun to get some more and see about fixing them up or

I do understand that,? my reply was more directed at fellows with the color CRT versions,? but for the 540 and it's ilk, mayhaps you could at least select the color of your monochrome.? Regarding

Several things about the TDS540, from what I've understood. One is that the BIOS is not smart enough to write in color, secondly is that IIRC the graphics chip is wired so that all outputs are going

John, I had the exact same pattern and it turned out to be noise on the AC mains. Turning off fluorescent lights did wonders to reduce it. The collector sweep comes directly from the AC through a