开云体育

We machined numerous complex science instruments for organic molecule detection of thoriated magnesium alloy HK31 (3.1% thorium) for the NASA Viking Mars Lander. The HK31 offered higher thermal

I’ve only heard of it as “Magthor” which, until this thread, I never connected to thorium. Thanks to Wikipedia, I now have a better idea of what my friends were talking about (and also that it

I don't either, but I think I've read about it somewhere in the past. I've seen pink and purplish insulators on microwave oven magnetrons, going quite a way back, but never knew for sure if that was

I have some Beryllium oxide TO-3 insulators that are blue as well as some Aluminiuum oxide ones that are pink. Bruce

Steve said: "Thoriated magnesium was even used in the Apollo program..." Huh, I have never heard of that before. What did thoriating do for the Mg? Ed

My first Tektronix which i bought recently, a 475, has Hughes Aircraft Co / Delaware Corp tag on it. The colors blend in well so I left it. I bought it from some locals off FB Marketplace that was

Thoriated magnesium was even used in the Apollo program. The frames of the computers (CM and LM) and some of the other electronics were made using it. NASA did a study of the radiation from these

I have a fair number of items with asset tags from SRI, Lawrence Livermore, Ampex, Nasa, etc.? I really hate tags all over front panels, and usually remove them, but will leave them if they are

I bought a 547 from a retired Radio Canada tech sometime in the early 90s. I think it was either because Don Lancaster mentioned these old scopes or I bought the 547 then I read about the 500

Speaking of BeO Tektronix used BeO substrates in some of the power hybrids. Specifically the gold plated TO8 packages with the heat sink post on the bottom. The substrates came pre-scribed in a sheet

Yes, I also see 2N3565 as the cross reference. This transistor may be difficult to find, you can start replacing diodes and the capacitor first. If it still doesn't fix the issue, and you can't find

Applying special effects to video using analog circuitry, no digital processors required David Sieg - Introduction to the scanimate part 1 https://www.youtube.com/watch?v=UHjkMThH0aE

Radiation is a bugaboo for many folks. Think of it this way, a little bitty birthday candle emits photons. It will scarcely light a room, leaving the edges dark. You can burn yourself, but don't count

I have a lot of interesting property tags on stuff, from all over. Naval Underwater Systems Center (doesn't exist anymore, absorbed into something else), LANL, Sandia, Boeing, IBM, Bendix Kansas City

A thoriated tungsten cathode will glow bright yellow. It gives an incandescent light bulb a run for its money. Nobody wants that in a radio tube. So, barium and strontium ceramics are used to get even

Anyone got a link for this mod? Schematic?

Well... I tried it, and made things worse (risetime ~ 3 ns, fall ~ 5 ns)! After some tweaking of pullup R and a shunt capacitor on the resistor to the PNP base, the waveform at the trimpot/TD has

Just acquired a working 7M13 but the C and H buttons are broken. The 10-way button assembly doesn't have a Tek part number in the manual, it is just listed as an assembly. Is there any source for it?

My interest in vintage Tek gear comes from my first two scopes, which belonged to my father: a 475 from his time working as a service engineer for Varian MAT, and a 2213 that he bought when he went

I'm pretty sure that at least for non-high voltage transformers, Tek used a black polyurethane varnish for impregnation. I recall long ago, I picked up a couple of expired gallon cans at the Country