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Aargh. "more unstable than", not "more unstable then", of course! Aargh. Ptth. -- Prof. Thomas H. Lee Allen Ctr., Rm. 205 350 Jane Stanford Way Stanford University Stanford, CA 94305-4070

Early yes, standard not so much. The 7033 is an MNOS (sic) EAROM. The underlying enabling principle was discovered when Gordon Moore punked the entire industry into chasing nitride gates as the

Sorry for the OT but I'm getting desperate - it's supposed to be a standard early NVRAM but it and it's data-sheet seem to be unobtanium. Regards, Dave

A few years ago the time delay relay in my 555 died and lacking a replacement I had to cobble up a substitute. I repurposed an old device I had made to trigger a super 8 movie camera (remember them?)

Appears to be the same one from about a year and a half ago. Lots of posts in the archives.

OCR'ed version added. Raymond

Thanks for the response. If endeavoring to do this (rtc + ram), there are already a number of folks that claim to have working solutions, so I would search out their progress and find the flaws and

Yes the 754s are really good scopes. I've got two, an A and a D. I am dreading the day when I need to get after this problem. I've already backed up the contents of the NVRAM via the floppy drive

Tom, Use 91% IPA for the coax inputs and socketed transistors. I use a small artist brush to apply the IPA then move then move them up and down in their sockets a few times to clean them. You do this

If the trace can center, then the circuit is in balance as far as the + section and - section are concerned, putting the same voltage on the plates. There is, however, no guarantee that it's the

Renée, The "originals" are the two "steel" finish nuts with diamond knurling on the bottom. The replacements are the black oxide finish and brass nuts on the top. -- Jeff Dutky

Thanks for the information. The reason that I was asking is that I have been working on a replacement for the battery backed SRAMs. I currently have an 8Kx8 board design that I am testing. It does not

" If you were building a replacement for one of these delay relays (hypothetically speaking, maybe for a 533A), would it be enough to have a timer that cut a relay in after a fixed time? Is that

" For instance https://frank.pocnet.net/sheets/084/6/6NO45T.pdf . Albert" Albert; thank you; I had been thinking of this too. In industrial controls, we would use on-shot (Time Delayed) relays too,

Jeff - which are the originals and which are "new"? Renée

Have you looked here? https://w140.com/tekwiki/wiki/2712 Not OCR, but probably useful. Failing that, try Artek Manuals (http://artekmanuals.com/). They don't have it listed but they might be able to

I believe the they are DS1486, and DS1250Y (from memory of reading recently) I guess maybe I should hunt the data sheets and re-familiarize myself with the beasts - I used to know something about

Thanks for suggestions I moved the gain pot slightly but it has little effect. The power supply voltages are very close to spot on and stable but the four metal output transistors Q610, 20 30 and Q640

I have added a photo album with pictures of the two replacements I have found compared to two sizes of thumb nuts from Tek instruments: /g/TekScopes/album?id=266234 I have also found

Mark, Thank you for the effort to inform me about the secundary voltages. I expected this already. If I decide to use a 454 transformer, which is identical to a 453 transformer, I have to do some