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The story I'd heard was that Intel learned that silicon nitride is excellent at gettering or otherwise blocking sodium. They pissed away a fortune trying to make a good gate insulator out of the

Guessing you both know the trick about holding a little NE-51 or similar neon bulb in close proximity to the HV section to confirm its operation? If your HV section is working, the little neon will

Jeff, Brenda is right about the corona dope. Leave those strips in. Clean them to remove dust. I have not seen any of the black beauties any good. These are a wax condenser in a plastic case. I

Hi Jeff, I am glad that I was able to contribute this this forum. I would have to say, in my opinion, since you started to clean that section, you should keep cleaning it until it is spotless. I have

Brenda, thanks for that tip; I had never heard of "corona dope" before, but a quick google search (on the correct term) reveals all. Any idea how I would test be certain that everything is okay? I

Hi Jeff! Great to see you are working on your 533A! I have one as well, but it's in really bad shape on the inside. Those 2 back strips is perfectly normal. My 535A and my 545A is like that as well. I

Fresh off of several victories with my 7603 and plug-ins, I turned my attention tonight to the 533A and found the courage to peek inside the left half of the HV section (the section on the opposite

Yeah, Tom, I remember reading about Gordon Moore or somebody else at Intel meeting with a gentleman from another semiconductor house and revealing the sodium issue in exchange for the solution to

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