While doing my spring cleaning I ran across a GI model W variac that is missing it's brush and brush holder assembly. It would not be much of a trick to fab up a new assembly but that raises a

Cliff, Beatshelloutta me. ;-) Mark

I just searched for "tektronix 7j20" and it said: "0 results found for tektronix 7j20" and then right after that: "More items related to 'tektronix 7j20'"

That is a great video. How do you do that. I found out the film itself also on youtube and seems to be is original clip from that song. So he feeds the video signal ( composite ? ) to the scope. Coult

Yeah, Don mentioned that too. See my previous post on Ebay's lousy search. ;-) Mark

Well, that's very strange. I didn't look that close at the listings, but those were what turned up on a search for "Tektronix 7J20". Looks like Ebay's search has gotten even worse than what we

Thanks. Those are 7D20s, not 7J20s. DaveD

Sadly, re-read the type. They are all 7D20s. Don Black.

Dave, Ebay item #'s 360442801904, 390586622614, and 130922343379. Mark

I see three 7D20s, but no 7J20s. Can you post the listing URLs for the 7J20s? Thanks DaveD

I guess you may have already seen this, but it's one of my all-time favourites. (Good music as well). http://www.youtube.com/watch?v=6Ac1G_5N73g John

Dennis, Your timing, as usual, is impeccable. There are currently three 7J20's up for auction on Ebay right not. ;-) Mark

The scopes I aw in TV shops in the mid '60 were free running, and very few would do 500 KHz. Several shop owners laughed when I bought a new Leader LBO-505 in the early '70s and told me scopes were a

Right. When I worked at a TV store in my youth we could tell when the vertical sync tube was shot because the vertical would roll slowly at 60Hz. Dennis

Dennis Tillman wrote: NTSC video is 59.94 Hz vertical and 15,734.34 Hz Horizontal. I used to watch TV by feeding the video output of an old Polarad SA into an amber computer monitor. Just for fun, I

I don’t recall how the physics professor had his 7834 set up to display the Portland analog TV signal. I had to use a work around because I didn’t have a corresponding TV signal to use. As a

Hi Dennis, very fun indeed! How is the 7L12 used here? I haven't got any ideas! Regarding using any scope in raster mode; this one was a head scratcher when I first tried raster mode.. In TVs we're

Hi Dennis, That is incorrect. The exact same problem exists in the continuous-domain Fourier transform, and basically in any other thing that assumes an unbounded continuous domain. This issue is

http://w140.com/tek_5t3_field_training.pdf

I meant a scan of the manual, from other postings I guess it's unobtainium platinum. Thanks for the explanations given. Don Black.