The 549 HV transformer is part number 120-0423-00 for anyone interested.

Hey Dave, congrats on the fix, it's pretty gratifying to bring one of those old'uns back to life. Beware that it can be addictive - I managed to put the brakes on at 8 scopes or so after the first one

Oh, on sections: I wind the transformers in several sections, each separated with at least one wrap of tape. Taps get a layer of double stick scotch tape (archival), and primary ends with 3T of Kapton

Thanks for the info David, I will revise my apparently out of date recollection. I have never seen one of Bill's rewinds, but I was just parroting what I was told by several who had. There were likely

Hmmm ... I wasn't aware of tools to dump the NVRAM to floppy --- where are they available for down load ?? Would they work on a TDS 744A ?? as an alternative to floppy (if they proove tricky) can it b

Jeff, What you're describing doesn't sound terribly sacrilegious. I'm sure we've all seen far worse. I like your take that a glue repair lends itself to a deeper repair later. I presume you personally

I have a 465B that is looking good and running well, except that the coupler for ch 2 amplitude var coupler is broken. Check these two tweets in a twitter thread for images of the broken part includin

Hi Raymond, Just wondering if you posted the schematics for the SR780 anywhere ? I've had a look over on ko4bb.com but couldn't find them. Many thanks, Jon

Ozan, One side is at 8.5xxVDC and the other is a pt 8.6xxVDC... It’s definitely shorted. I’m guessing next is to replace it and go from there... Will do and report back.

Leo, So it seems like the part number of the manuals remains consistent, but there are significant revisions inside which people need to be aware of. I wonder how many other changes occur between thes

Sorry, forgot the part number of my manual 070-1193-00 Leo

Hi, When I got my 485, it came with a non original printed copy, but it did have the A2 size fold out schematic ms. A closer look suggests I have a Frankenstein manual: The replaceable electrical part

Leo, Very interesting. What is the part # and revision date of the manual and the Electrical parts section you are using? All copies of 070-1193-00 that I have show the manual revision date as: "REV8

When I got my 547 around 2000, it had transformer disease and I bought a Bill Schell rewind. Today I peered into the compartment. It's clearly universal-wound with its characteristic moire pattern and

??120-0308-00 Dave Wise ________________________________ Sent: Tuesday, January 26, 2021 11:09 PM To: TekScopes@groups.io Subject: Re: [TekScopes] 549 transformer question What is the Tek Part number

When I need a couple thousand volts fast recovery I stack UF4007 in series.? Dave Wise ________________________________ Sent: Wednesday, January 27, 2021 12:47 AM To: TekScopes@groups.io Subject: Re:

Before digital storage, CRTs with P7 (or other long-persistence phosphor) were used for physiological monitoring. The early patient monitors in ICUs and ORs had these CRTs. The reason was that with th

Are you using the calibrator (and horizontal adjustment) for setting/calibrating the horizontal position? The DC ("0 Hz") position is not useful for that. Use e.g. 50 MHz and always set dialing CW, si

You're right of course, Chris, it's not a frequency meter. The specifications mention a readout accuracy of +/- (10 MHz + 1% of the dial readout). Raymond

And mine arrived yesterday, here in the frozen tundra of Quebec, Canadaland. So much more better to read the physical copy than a PDF. Thanks again to Dennis for arranging and doing the legwork. wrote