Search found 826 matches

by Jerry Biehler
Wed Sep 19, 2018 1:55 am
Forum: The Trading Post
Topic: Stuff for sale at Halted Supply in San Jose, California
Replies: 3
Views: 133

Re: Stuff for sale at Halted Supply in San Jose, California

Dang, Im not surprised. They moved to the new location a couple years ago now. There prices always were a little high.
by Jerry Biehler
Sat Sep 01, 2018 6:16 am
Forum: New User Chat Area
Topic: What flange is this?
Replies: 5
Views: 616

Re: What flange is this?

Looks like a special. Should be easy to make an adapter for.
by Jerry Biehler
Fri Aug 24, 2018 5:49 am
Forum: Vacuum Technology (& FAQs)
Topic: convectron 275 tube and controller
Replies: 9
Views: 1112

Re: convectron 275 tube and controller

I might be able to get pinouts, but do you have a source for the tube end of the connector? It is proprietary.

Convectrons are good, I am putting them on my big system, just got to make sure they are orientated so that the tube lays horizontal.
by Jerry Biehler
Wed Aug 22, 2018 3:55 am
Forum: Vacuum Technology (& FAQs)
Topic: Debugging an Inficon PKR 251 Series Gauge
Replies: 3
Views: 430

Re: Debugging an Inficon PKR 251 Series Gauge

Send it back and get your money back, I usually dont spend more than $100 on these units.
by Jerry Biehler
Sat Aug 18, 2018 2:43 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: DIY hermetic feedthroughs: Has anybody done this?
Replies: 5
Views: 782

Re: DIY hermetic feedthroughs: Has anybody done this?

I actually worked at bullseye glass for about 2.5 weeks before I was canned for "not being excited about glass". Sigh. Anyway... Most art glass is soda lime. We had special machines build specifically for the job but you could do a ball mill with a bunch of alumina balls which you can get off ebay. ...
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: 5
Views: 782

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
Fri Jul 20, 2018 7:13 am
Forum: Images du Jour
Topic: Killer deal on a GeLi gamma spec
Replies: 6
Views: 775

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: 613

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: 775

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: 553

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...