Looks good! Will it pass the CAL01 procedure?

It is easy to discern if a Tek scope was made in China. If you can see the serial number, and it begins with "C", it was made in China.

What about an SMD fuse perhaps soldered in where the Tek ceramic part was?

Michael, Yes, used on all, my B36xxxx instruments have them as well.

They are placed between the rectangular HV ceramic caps in the CRT HV module.

The fan on my 7904A is very quiet, a non issue on mine at least. I suggest that the most important thing will be finding the best instrument available around your location. Packing properly is difficu

Remove the bottom cover, there are relays accessible from there.

How is that done??

Schematics are available on ko4bb.com.

Here is the Sherwin Williams info: Call: Portland (Oregon) Commercial at (503) 249-0222 They supply Tek Blue (Portland Commercial 4383) The Omi-Pak cans of spray lacquer are marked: OPEX L61 Lacquer L

I believe that the AN/UPM-137 IFF Test Set, at least the units made by Teledyne Electronics back in the day, had a Tek made CRT.

Michael, Yes, I am very familiar with the 576, having worked on many dozens of them. The bottom cover screws if too long, can bind with the the test fixture. Interestingly, there were some 177's that

The screws were not, from the factory, intended to retain the 177. Often someone would put the wrong screws in the forward two holes thereby effectively locking the plugin in place. I suppose that at

Pulls out, but DO NOT pull on the Vertical Current knob , it has a plastic coupling and you will break it! There can be two sources of friction preventing easy removal; there are short screws securing

I don't think the variac is bad, it just isn't going all the way to zero. You can also measure the voltage between C-E on the test fixture with the Polarity set to AC. Have you removed it from the ins

Eric, Too bad the tube is weak, but very typical, I probably at least a dozen bad 576 tubes up in the loft, that I can't quite bring myself to toss. You have the later HV transformer, so no worries th

Dennis, no other instrument used the 154-0563-xx CRT, unfortunately.

You can set the mains input selector to the LOW position. This will increase the CRT filament voltage somewhat, and will increase the brightness at least a little. It also increases the LV regulator d

Peter, I need to put this instrument back on the bench to investigate further. It has been shelved for awhile. U950 is the the Z-Axis hybrid, these can be defective, I have replaced a few over the yea

My instrument has a new NVRAM, I routinely replace the Maxim/Dallas part with the less expensive ST M48Z08 part. The new, or the old, NVRAM make no difference with the sluggish or sticky control actio