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Raymond, Per your advice (and that clearly marked on the PCB!), I have purchased an isolation transformer. After watching a few videos online, I am still unsure whether I should connect ground from

PSU is most likely culprit, you will have fun digging down to get to it. Search the archives for info on this, there were many threads regarding the way to test the PSU out of the scope (carefully)

U360 is a plain vanilla 741 opamp

Dave, I recently stripped mine with acetone. That and gloves, a mask, and loads of paper towels had it stripped and sorted in a reasonable time. Work outdoors for best safety. My mistake was using an

Do you have the service manual? You can find it at w140.com/tekwiki. Your measurements of ripple are only slightly greater than the specifications in table 6-4 which also lists the limits on the DC

Ed and Chuck: I cranked up 7104/7A29/7B15. These were originally made for AES nuclear testing and 1000s used at LLNL, Los Alamos, LBL, etc. It was CALed by a silent key, Walter, a super

Hi Ed, Vertical deflections that remain flat for the entire width of the screen, regardless of the sweep speed, are by my definition low frequencies. Sweep speed has no effect on my scope's

I am certain that they are NOT all like this.... At least not to the same degree mine is. For instance, mine cannot, ever, under any circumstances develop a straight trace at the center of the screen.

It is chapter/part 3 in the Army one.

Agreed...perhaps a shipping container......what really grieves me is before moving out there I spent 4 years commuting back and forth from the UK to Everett every 4 weeks or so and my route was to

I was going to ask a stupid question: is the USD, UKP or EUR. But they are all about the same thing now! Craig

Very nice work John- would that paint stripper remove my drool after looking at your collection? Seriously, a wonderful collection you’ve amassed- thanks for the post!

I had to put this aside due to other things but during that time I kept working on other electronics and have really learned a lot. I had been over that scope with a fine tooth comb, I checked every

Chuck said: "Power supply coupling between the amplifiers would most certainly have a dynamic component to it. This is purely static in nature. I can move the dot using the H and V position controls,

Ah yeah, the trick is that I am unsure of the actual pin numbering on the CRT itself. Is that shown in the manual you have? Thanks!

Jared, According to the service manual (with schematics), 070-8405-01, from Qservice, the CRT pinout is: 1 Control grid 2 Filament 3 Cathode and Filament 4 Focus 5 Astig 6 Vert- 7 Vert+ 8 Horiz+ 9

This scope looks like it has two timebases. However it actually has three. The fastest sweep speeds use the third time base. So one should probably test ALL sweep speeds to make sure they all work. I

I'm currently repairing a 224 portable scope (the battery powered hand held one) and had a small problem where the plug for the CRT came apart when I was unplugging it... I think I got the pinout in

Chuck, I'm a little surprised that someone hasn't surfaced to tell us that they were all like that.? Surely one of the thousands of participants on this wonderful site must know, or have been there

Hi Miguel, Thank you for the Interconnect book. I also looked at page 19-5 TR502 Tracking Generator. This appeared to be duplicate information for what is on page 17-3. Dennis Tillman W7PF