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Hi Jason: You can also check out the downloadable Tek Concepts Series books by DeVere, on the TekWiki: Oscilloscope Cathode-Ray Tubes, 2nd ed. Storage Cathode-Ray Tubes and Circuits, 2nd ed. … and

Hi All: Tek just talked me into downloading their new... well new to me anyway... their newly reworked "XYZ of Oscilloscopes. This one has a snazzy motif of a DSO screen, displaying multiple signals.

Wow. Thank you for the education on the expansion mesh. It makes complete sense why the 500-series tube-based equipment have such sharp traces - they were using much higher voltages on the deflection

Great to know. Thanks everyone. Now I have something new to look up - expansion mesh is something new to me. :-)

Peter, Here are some comments regarding the 576, 577, and TDS644A. Yes, the brown HV transformer is the bad kind, so it will likely crap out soon. The symptoms are about right. The 576 v. 577

The last post got me thinking- does the 7503 have an expansion mesh?? My working unit has surprisingly sharp traces and the RO is smaller/tighter compared to my many 7603s.? (I'm guessing it does

Many photos of scopes in general have the intensity turned up so that the traces are easily visible, which makes the traces fatter.? That said, the 7603 when adjusted, will have nice traces, but

They're not like an old 564 for sharp traces. But 7854, 7844, 7603 is as good as 2230 and such and plenty usable.

Hello All, Curiosity question for the group. I've been contemplating trying to find a nice 7603. I've looked online at the google images of traces and readouts on the screens of the 7603, however most

I suspect that the problem you originally mentioned is a result of the 100V being loaded by the lossy HV transformer, the symptoms are classic. These transformers are difficult to find, as so many

Thanks for the responses regarding my questions on the vertical traces. I was thinking it could be normal, but now I know it's normal and nothing to worry about. Ed Pavlovic

Thanks Bob and Chuck. Unfortunately my 576 has a brown HV transformer, I just looked. I also checked C759 in the 5v power supply and I replaced it a few years ago. My repair log shows how I adapted a

Thanks for informing me C744 is a 170uF capacitor, I believe what happened I accidentally interpreted the u in uF as another zero and thought it was 1700uF, certainly made it easier finding a

Yes, that is a consideration that I try not to think about. I guess I had better get my transformer business back in order this winter. -Chuck Harris Bob Koller via Groups.Io wrote:

Not an assertion I would make! I had one 7104 that had a permanently etched reverse image of a square wave and a triangle wave... obviously from a function generator. I know that there is a large

Hey Peter, I repaired one of those from a TDS684A which had failed in an interesting mode. The TVSes had become uni-directional, and so current was flowing through the TVSes, T3 and Q9 continuously.

It may have a PSU problem as Chuck described. However, if the 100V supply is being loaded, this sounds like the CRT HV transformer problem typical of the older brown encapsulated transformer design.

I got 0.07 USD for a class action lawsuit on bad motherboard capacitors back in the day. Probably related to many different products. 73! Mark KA6WKE Website: https://www.ka6wke.net Live Stream:

Roy, I got very lucky a couple weeks ago and scored a basically pristine 7104 and it's intended plugin complement at a .gov surplus auction for a very good price (all of the above for $125). It is

I don't know what shape your 576 is in, but I have found many with bad 5V filter capacitors. They suddenly go open circuit. They are the Mallory FP style, and the internal aluminum strip that connects