Search found 450 matches

by ian_krase
Wed Sep 19, 2018 5:13 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

It's unfortunate. I'm a bit surprised as they were far better than the recently closed Wierdstuff Warehouse. Perhaps Excess Solutions will buy them out and expand their hours to something we can actually attend. I don't agree that they were across the board expensive at all. Their prices for oscillo...
by ian_krase
Tue Sep 18, 2018 7:45 am
Forum: The Trading Post
Topic: Stuff for sale at Halted Supply in San Jose, California
Replies: 3
Views: 133

Stuff for sale at Halted Supply in San Jose, California

Halted Supply in San Jose is apparently going out of business over the next several months, and having a big sale (20 to 50 percent) this week. Notable stuff: - High voltage probes and meters - doorknob capacitors. - ancient ion gauge controller - Swagelock VCR solenoid valve - huge quantities of ce...
by ian_krase
Tue Sep 11, 2018 7:46 pm
Forum: Images du Jour
Topic: My first plasma
Replies: 12
Views: 987

Re: My first plasma

One thing that might be tried is to have separate beam blocks and structural vacuum chamber. The former can be made of cheap thin glass.
by ian_krase
Sun Sep 09, 2018 8:12 am
Forum: Images du Jour
Topic: Sharing hamfest booty images
Replies: 27
Views: 5243

Re: Sharing hamfest booty images

Nice valve! I paid more like 30 for mine!
by ian_krase
Sun Sep 09, 2018 4:07 am
Forum: Images du Jour
Topic: My first plasma
Replies: 12
Views: 987

Re: My first plasma

Not sure what you mean by an "arc from the grid to the glass" -- may need better pictures.

Your glass looks too clear for sputtering to be a big problem. Is there a hot spot?
by ian_krase
Thu Sep 06, 2018 2:38 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Capacitor blasts and automatic impedance matching
Replies: 1
Views: 210

Capacitor blasts and automatic impedance matching

I am sort of curious whether there's any practical circuit that automatically does some form of impedance matching on capacitor discharges -- can crushers, spot welders, flashlamp flashers, etc.
by ian_krase
Thu Aug 30, 2018 5:30 am
Forum: Vacuum Technology (& FAQs)
Topic: convectron 275 tube and controller
Replies: 9
Views: 1112

Re: convectron 275 tube and controller

Edge 10L -> Shield -> 1 -> Null Whiteblack Edge 11 -> Lowp -> 3 -> Tub 3 Redblack Edg 12 13 -> HighP -> 4 - > Tub1 Red Edge 14 -> Comp -> 8 -> Tub2 Greenblack Edge 15 -> Sense -> 9 -> Tub5 Green Here is the wiring table from my own attempt. The same for both analog and digital gauge controllers. The...
by ian_krase
Sun Aug 26, 2018 4:48 am
Forum: Vacuum Technology (& FAQs)
Topic: convectron 275 tube and controller
Replies: 9
Views: 1112

Re: convectron 275 tube and controller

Oh, also, if these are the controllers with the big .156 pitch edge connector on the back:


Two of the pins on this edge connector need to be connected for the controller to work.
by ian_krase
Fri Aug 24, 2018 8:04 pm
Forum: Vacuum Technology (& FAQs)
Topic: convectron 275 tube and controller
Replies: 9
Views: 1112

Re: convectron 275 tube and controller

Duniway Stockroom sells the connector but it's not in their catalog, yo need to ask for it.
by ian_krase
Mon Aug 20, 2018 12:31 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

Rotary vane pumps definitely get quiet when the pressure and gas load are small, but it's not terribly sensitive.