Search found 826 matches

by Jerry Biehler
Thu Aug 16, 2018 3:14 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: DIY hermetic feedthroughs: Has anybody done this?
Replies: 3
Views: 88

Re: DIY hermetic feedthroughs: Has anybody done this?

Well not every hydrogen thyratron. I have seen small ones that have dumet seals and big ones that are metal ceramic. Its pretty easy to do a U glass seal to tungsten. Get some borosilicate U glass, it is still available now and then. Heat up the tungsten you will be using as the electrode in a flame...
by Jerry Biehler
Sat Aug 11, 2018 2:43 am
Forum: The Trading Post
Topic: 10x CHEAP TURBOS w/ controller (Pfeiffer TMH 261) on ebay ~$50
Replies: 9
Views: 527

Re: 10x CHEAP TURBOS w/ controller (Pfeiffer TMH 261) on ebay ~$50

Its a good price, I have bought used leybold 700l/s pumps from ebay for about $600. I would almost consider getting one of these for my SEM, I recently stuck a really old pfeiffer on there to replace the varian 300 that developed bad bearings. Yes, the hirshmann connector is the black square one. Mo...
by Jerry Biehler
Fri Aug 10, 2018 1:35 am
Forum: The Trading Post
Topic: 10x CHEAP TURBOS w/ controller (Pfeiffer TMH 261) on ebay ~$50
Replies: 9
Views: 527

Re: 10x CHEAP TURBOS w/ controller (Pfeiffer TMH 261) on ebay ~$50

LOL, the servo drives have nothing to do with the turbos. I have no idea why they are paired up with them. The drive for the turbo is the silver block attached to the side of it. You WILL need to replace the oil cartridge on these in the very least. They only have one bearing in the bottom which is ...
by Jerry Biehler
Fri Jul 20, 2018 7:13 am
Forum: Images du Jour
Topic: Killer deal on a GeLi gamma spec
Replies: 6
Views: 598

Re: Killer deal on a GeLi gamma spec

FWIW, Hf is used in plasma cutter tips, its that little silver piece in the center of the electrode, it melts and helps stabilize the arc.
by Jerry Biehler
Fri Jul 20, 2018 7:10 am
Forum: New User Chat Area
Topic: HV feedthrough purchase problems
Replies: 4
Views: 449

Re: HV feedthrough purchase problems

Call them. Do not rely on email.
by Jerry Biehler
Wed Jul 18, 2018 12:25 am
Forum: Images du Jour
Topic: Killer deal on a GeLi gamma spec
Replies: 6
Views: 598

Re: Killer deal on a GeLi gamma spec

Usually GeLi sensors are fine being warmed up, they are used in EDX as well on SEMs and TEMs. The issue is the beryllium window. If the dewar has been cold for years they tend to build up condensed vapors inside the dewar insulation since they are basically a cryopump. When the dewar heats up the pr...
by Jerry Biehler
Sun Jul 15, 2018 8:50 am
Forum: New User Chat Area
Topic: VACUUM CHAMBER
Replies: 5
Views: 408

Re: VACUUM CHAMBER

No, glass is fine for a lot of vacuum systems. They have been used for over 100 years and are still used. Plexi is an OK vacuum material as well there are commercial turbo pumped systems available with acrylic doors or bell jars. I have an 18x18" glass bell jar and it is very nice. I have had it dow...
by Jerry Biehler
Tue Jun 26, 2018 4:04 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Couple of questions
Replies: 34
Views: 2971

Re: Couple of questions

Roofing suppliers might have lead sheet.

You dont need a faraday cage, you are not working anywhere near the voltage that would require one.
by Jerry Biehler
Fri Jun 08, 2018 7:53 am
Forum: Images du Jour
Topic: Cryocooler
Replies: 1
Views: 709

Re: Cryocooler

It's a sumitomo cooler, you will need the compressor section to go with it. Probably something like this: https://www.ebay.com/itm/Sumitomo-MRI-Helium-CSW-71C-Compressor-Serie-47C02192D-With-Cry-Control-Unit/112995151231?hash=item1a4f092d7f:g:TRsAAOSwB09YPygw Though you could probably make a CTI com...
by Jerry Biehler
Fri Jun 08, 2018 6:33 am
Forum: The Trading Post
Topic: MKS 901p vacuum gauges
Replies: 7
Views: 1575

Re: MKS 901p vacuum gauges

I use RealTerm, probably the best terminal for techies out there that I have found. All sorts of cool options.