Search found 323 matches

by Rex Allers
Sun May 24, 2015 8:29 am
Forum: Images du Jour
Topic: First Plasma Achieved
Replies: 5
Views: 2528

Re: First Plasma Achieved

John Futter wrote: I would think your vacuum in the chamber is around 0.1 millibar aka 2 x 10 to minus 1 torr.
John, Isn't 0.1 mbar = 0.075 Torr? Not critical to the general discussion, but what pressure did you actually think you were seeing in the plasma?
by Rex Allers
Sun May 24, 2015 7:20 am
Forum: Vacuum Technology (& FAQs)
Topic: Fixing an Analog Thermocouple Gauge
Replies: 11
Views: 6560

Re: Fixing an Analog Thermocouple Gauge

I don't have a lot of experience and thought someone else might chime in, but let me ask one thing. You said, "When plugged in the meter's needle moves from OFF to ATM, meaning it reads at some voltage but doesn't move from there." That sounds like proper operation. Have you connected it to a vacuum...
by Rex Allers
Tue May 12, 2015 10:12 am
Forum: Vacuum Technology (& FAQs)
Topic: TG-550 TC vac gauge tube
Replies: 9
Views: 4888

Re: TG-550 TC vac gauge tube

Thanks for the replies. I do have a copy of a Bell Jar article that gives some details on DV-6M, 531 and 6343. Good info and helpful overview. I also have a Teledyne Hastings table that gives pins, heater current and general parameters for 7 of their tubes. Maybe the phone calls are a good idea. In ...
by Rex Allers
Mon May 11, 2015 6:21 am
Forum: Vacuum Technology (& FAQs)
Topic: TG-550 TC vac gauge tube
Replies: 9
Views: 4888

TG-550 TC vac gauge tube

I recently acquired a bunch of surplus parts. Among them is a vacuum thermocouple tube, Anelva TG-550. This stuff is probably circa 1990. I looked for data and found this page with just basic info for the current TG-550C version: https://www.canon-anelva.co.jp/english/products/component/vacuum/vac_d...
by Rex Allers
Thu Aug 07, 2014 10:39 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Bremsstrahlung Radiation Detection
Replies: 16
Views: 5951

Re: Bremsstrahlung Radiation Detection

For a cheap but effective MCA, here's a link to to a popular Italian project. http://www.theremino.com/downloads/radioactivity I haven't used it myself but have seen others' good results posted. It is based on getting the signal input through a decent sound card. The software is free for download. I...
by Rex Allers
Sun Jul 06, 2014 6:23 pm
Forum: Vacuum Technology (& FAQs)
Topic: Edwards E2M12 trash or rebuild
Replies: 9
Views: 3575

Re: Edwards E2M12 trash or rebuild

Richard,
Thanks for the positive words about the Yellow Jackets. That's good encouragement to use the one I have.

Dennis,
I guess I was hoping someone would have some magic to try. I'm going to see if I can cancel the purchase and return the Edwards pump. It's definitely not worth the money I paid.
by Rex Allers
Sat Jul 05, 2014 11:16 am
Forum: Vacuum Technology (& FAQs)
Topic: Edwards E2M12 trash or rebuild
Replies: 9
Views: 3575

Re: Edwards E2M12 trash or rebuild

The refrigeration pump was a used eBay purchase. It's a Yellow Jacket 6 CFM and shows external signs that it was used a while. That was a decent buy. Working pretty good now but I'm not sure how it will hold up if I run it many hours continuous. I've heard these types of pumps wear out pretty fast a...
by Rex Allers
Fri Jul 04, 2014 11:41 pm
Forum: Vacuum Technology (& FAQs)
Topic: Edwards E2M12 trash or rebuild
Replies: 9
Views: 3575

Edwards E2M12 trash or rebuild

My luck at buying pumps is bad. Wanted a decent backing pump and found a E2M12 locally. Seller said, "Like new vacuum pump in good working order." When I picked it up I noticed some brown residue in the exhaust port. Seller seems like a decent guy. I asked him how it had been used and he said for va...
by Rex Allers
Thu Feb 06, 2014 9:46 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: HV Cable DS2124
Replies: 5
Views: 3239

Re: HV Cable DS2124

Thanks, Richard. Just the sort of info I was looking for. Good to know it will be a FAQ.
by Rex Allers
Thu Feb 06, 2014 1:19 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: HV Cable DS2124
Replies: 5
Views: 3239

HV Cable DS2124

Looking at a catalog from an HV supply manufacturer, they seem to change output cables from RG-8 to DS2124 at about 75 or more KV. I did a search here for 2124 but didn't find any hits. I found one link in my web searches on the mfg site with a some info about DS2124. Seems DS = Dielectric Sciences....