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CTR UHV of need reason

NO4?? I didn't see that. I've no idea what you're talking about. Someone else who knows more should answer this, but I see no reason why a good clean tube connected to a good HV system could not go

setup 5. You trap perhaps pump

Believe me, I was watching that one closely. It was exactly the size I need (12" ID). It jumped to $250 or so shortly before it closed. My budget will probably have to stay around $100. I can find one

You'll have to search eBay for Bell Jar, refine the search for completed items and look for October 28 ... Ken Hunter wrote:

OOPS... Sorry, it sold yesterday... see eBay Item number: 2566818474 Keep checking eBay, I've seen 24 inch Stainless Steel jars sell for $49.00 and the same jar sell for $350.00 depends who is

Was a 12 inch by 17 inch glass bell jar and screen on eBay a few days ago... might still be there. Price was somewhere around $50 when I saw it last. Ken Hunter

Depending on the oil and how clean your rig is, probably 1x10^-5. You really don't want to run without a cold trap, in my opinion. Again "depending", perhaps 1x10^-8 with LN2. Dry ice and acetone. You

here are my questions 1) how much ultimate vacuum i can achive with a diffusion pump setup bellow a) without a cold trap ( and oil backstreaming problem that go's with it ) b) with a cold trap c) a

i am a new member to this group and quite happy to see that many people here share the same ideas about the many technicals aspect of high vacuum ( it is COOL) :)

Dear all, does anyone know of a place near hamilton, ontario that will aluminize a 6 inch parabolic mirror? the old finish would have to come off first. approximate costs? Thanks in advance, anton

Hi, Good books on general vacuum coatings are rare. I've been coating about 6 mirrors every weekend lately. There are 100 secondary mirrors that I will apply enhanced silver. Multiple layer coats

Hi Bill, In the Jean Texereau's HOW TO MAKE TELESCOPE, the requirments of transformers for evaporation and H.V. discharge is at least 20V,50A and 5KV,50MA. I think that a welding machine(my LINCOLN

Hi James, Can youy comment on the power requirements (volts, amps) of your evaporation filament? Thanks! -Bill went as <snip>

Sounds like an exciting day! Don **

I will be at at the Coating 2003 meeting in Indy. I will be at the Society of Vacuum Coaters booth some of the time. I am also giving a tutorial on vacuum coating if you have a chance to drop in. Don

Thanks Don, for your reply regarding the oxygen plasma. This list sure has been quiet lately... Have any of the amateur telescope metallizers ever attempted to aluminize any mylar or similar plastics?

The air plasma (N2 + O2) oxidizes the carbon to CO2. This is the basis of a lot of plasma cleaning - the oxidation produces a volatile oxide. Don **

Guys, This propane-tank vacuum metallization system of James Lerch at http://lerch.no-ip.com/atm/Chamber.htm is by far one of the coolest hobby devices I have ever encountered! Thanks for posting that