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Tekscopes troubleshooting rule number 1: Check all the power supply voltages. I recently had a similar problem on a 7904 except my distortion was at at the bottom of the waveforms. Turned out to be

Morris, I have created a photo album with an image of the distortion I am seeing /g/TekScopes/album?id=272587 Does this look similar to what you are seeing? — Jeff Dutky

Bonjour Monsieur Bravo to have acquired several of the great 7904, classic 400 MHz A photo of the screen displaying all aspects will be helpful 1/ shipping damage can ruin delicate CRT deflection

Here's what I'd do to make a definite diagnosis: Look at the vertical deflection plate voltages. If they look fine, then that pretty much leaves the crt as the only culprit. In that case, there's

Morris, I understand the desire for this to be something other than a CRT fault, and that’s mainly why I don’t trust my (motivated) reasoning, but what are the chances that some chaotic

Thanks Jeff, That is indeed very interesting, your description sounds exactly like what I am seeing in the 7904. I certainly hope it's suggestive of something other that a CRT fault. I'll wait and see

Morris, by shear coincidence I just got a 465B what sounds like the same problem with the CRT: a kink in the traces in the upper half of the screen. I had thought (and still do, until proven

Hi all, I recently picked up a couple of 7904s with a stack of plugins. While most of the plugins are OK, the mainframes have some problems. One of them looks very good but is completely dead despite

Tek had a number of different forms of these pieces. Some have solder posts, and some are made for riveting to the board. Some are just contacts to go from the mount, via the fingers, to the board

Hello, Occasionally I will search nation wide on Craigslist for vacuum tubes. During a recent search, I came across this add for a 570 curve tracer Looks really nice and has all the test fixtures and

I turned 68 a few months a few months ago. I lost nearly 50% of my peripheral vision a couple years ago ago. Anything below horizontal is only a blur, my optic nerves swelled up, probably due to a

Thanks! It's going onto the bench in the morning...

H?kan Any idea what instruments these parts were used in? — Jeff Dutky

Tim, Welcome to the group. You said the meter part does not work. If it is dead, the filter electrolytics would be a likely suspect. Something like Nichicon UHE would work. The values can be raised.

Either the P/N or the picture is wrong. The contacts shown are 131-0604-00: http://www.hakanh.com/dl/docs/kitinstructions/040-0541-00.pdf As far as I know there are no other P/N that looks like that.

I have a 529RM and several newer waveform monitors. [email protected]> wrote:

The 2465A in question now has developed a variation of this issue. It is affecting the lower half of the display including any activity which someone might be measuring. https://youtu.be/gi_AVZUKyqg I

Welcome, Tim!! You have a lot of expert help here so don’t feel afraid to ask questions. I have a friend who lives up in Pikeville that occasionally finds test equipment for my collection. As for

Hi, As far as i remember, this type of nvram can actually indicate the low battery condition, by reading some specific addresses in specific sequence by the cpu. Apparently the firmware has this

Hi Szabolcs, Thank you for these encouraging arguments, I will probably go ahead and order a couple of these NVRAMs as they are not that expensive. One thing though, one of the tests, 4700, mentions a