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It turns out those aren't all that difficult to disassemble - at least not down to the pot that's at the furthest from the front. I was able to reinforce the connection that was intermittent and the

Hi Mark, Thanks much for the tip. I'll give that a try. Neil

Neil, Replace the 9V zeners with BZX85B9V1. The originals will be open. The other 9V zeners in the scope will be open also. I replaced the axial type condeners in parallel with the zeners with film

The bezel I ordered came in today. I cut a small piece of the red filter and it works great! Thanks again for that suggestion. Thanks, Barry - N4BUQ

Subject should have stated 7B50/7B70 instead of 7B50/7B90. Thanks, Barry - N4BUQ

While troubleshooting the triggering problems in my 7B50, I discovered that the LEVEL pot is intermittent on one side. This is one of those stacked, plastic pots with a switch at the end and serves as

Hi Craig, I see that this is an old topic, but did you ever resolve this issue? If so, how? I have a similar story in process with a 7904A. Neil

Sounds like an "eye" diagram. It's a diagram of multiple overlays of data and clocks that show when data is stable (with respect to the clock). You display data while syncing to clocks, but allow long

I have added 16 images to the album showing the cal signal via a properly adjusted probe at 1 ms per division (horiz) and 1 volt per division (horiz). Each image has the trace position half a division

I think I found the prime problem. The LEVEL pot is defective. I don't know what made me decide to check that but, when I did, I found that the end that connects to P260-7 isn't making good contact

Roy, I described a modification to use a lithium-ion 18650 cell plus a boost converter in an earlier message: /g/TekScopes/message/165764 --John Gord

I was idly looking at TekWiki the other day, and I noticed that on the TDS784 page (https://w140.com/tekwiki/wiki/TDS784) there's now a link to "Telecom Test and I-Pattern Software TTiP". I haven't

Hi all, I have uploaded some pics of the 7904 problem to Jeff's photo folder of distortion on his 465B . They show two 7904 traces, one with the calibrator square wave and one without. They are OK on

It looks like DC level is different in different mainframes. R7903 shows signals centered around 0V. Diff pair following TP101/TP111 has good common mode rejection, 50-100mV DC shift at the input

If you have a Variac which can handle the current, you can do even better. Connect the coil to the output of the Variac. When degausing, turn the Variac up to the highst level you are using. Then,

I have now written a Python program for reading the data and creating a snapshot. It uses a Prologix style Gpib adapter to interface with the scope. I would like it to interface with Linux GPIB, but

Oh yes! Been there, done that many times. And it usually works great. You can make a very effective degaussing coil by purchasing a 100 foot roll of #14 NM with ground electrical cable at your local

The batteries are 5/4 AA size nicads. The holders are far more difficult to find then the batteries. I don't know if anyone has made a 3D printed version of them. It is very bad for the power supply

There is a picture of one of the early (gray) ones like this one on Tekwiki that has the same box/panel. I think they moved the box to the other side and made it longer and skinnier on the later blue

Got it, thanks. I don't know why I had such a hard time with that other instance of the google drive file... Sometimes it works for me, and sometimes it doesn't. Either of you guys have any thoughts