Search found 45 matches

by Ed Meserve
Sat Jul 11, 2020 10:13 pm
Forum: Items For Sale
Topic: Seiko Seiki STP-H300C Turbo Molecular Pump for Sale
Replies: 0
Views: 455

Seiko Seiki STP-H300C Turbo Molecular Pump for Sale

I have a Seiko Seiki STP-H300C for sale for $600 plus shipping. I have not tested it (hence the cheap price), but it spins freely. I acquired it with a pile of other equipment, without a controller. I don't think I will ever need this kind of horsepower (around 300 L/s) and used controllers I've see...
by Ed Meserve
Sun Jun 28, 2020 10:14 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Home Built Metering Panel
Replies: 10
Views: 6544

Re: Home Built Metering Panel

Rich,
I have a Fluke 6kV probe that I can use to check it.

I think I'll change over to the acrylic sheet with standoffs now, instead of running with wood. I'll leave it with the 200MOhm for now, but leave space to upgrade the chain.

Richard / Rich / John, thanks for the input!

Ed
by Ed Meserve
Sun Jun 28, 2020 9:38 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Home Built Metering Panel
Replies: 10
Views: 6544

Re: Home Built Metering Panel

John, How would you rate a PEX standoff (yeah I know, plumbing, but it's what I have lying around) with Two part epoxy with a zip tie for additional strength? The plexi would be vertical and the PEX would be horizontal standoffs. This is a junk piece of plexi for testing. The one I would use won't h...
by Ed Meserve
Sun Jun 28, 2020 5:49 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Home Built Metering Panel
Replies: 10
Views: 6544

Re: Home Built Metering Panel

The resistors I used came from Digikey. They are rated for 4kV , 1W. rnx.pdf I soldered the two 100 Ohm resistors leads together, then slipped them into an small segment of aquarium airline tube, with just air in the tube. Then I sealed them in with Liquid Tape. Once cured, I slipped that into a 7/1...
by Ed Meserve
Sat Jun 27, 2020 4:24 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Home Built Metering Panel
Replies: 10
Views: 6544

Home Built Metering Panel

Dennis made an suggestion that I detail the build for my home built metering panel as an example for other newbies, so here it is. The first step for the uninitiated, should always be the FAQs; Read, then re-read https://fusor.net/board/viewtopic.php?f=29&t=4267 , https://fusor.net/board/viewtopic.p...
by Ed Meserve
Mon Jun 15, 2020 1:17 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Restarting Efforts on Demo Fusor II
Replies: 25
Views: 1715

Re: Restarting Efforts on Demo Fusor II

Thanks Richard / Dennis for the kind words. I would be glad to go into more detail with the gauge system; I'll step through in detail how I followed Richard's excellent FAQs on the subject. As far as the vacuum leak goes, at this moment everything is suspect. I basically slapped everything back toge...
by Ed Meserve
Mon Jun 15, 2020 2:43 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Restarting Efforts on Demo Fusor II
Replies: 25
Views: 1715

Restarting Efforts on Demo Fusor II

It has been a few years, since I last had done anything with the fusor. After all the participants in the USM fusion group graduated, the lab manager informed me that he needed the storage room emptied and that all of our gathered materials and equipment were going to be disposed of unless I took it...
by Ed Meserve
Mon Jan 20, 2020 1:39 am
Forum: Philo T Farnsworth Archive
Topic: Is It A Farnsworth... or a Hirsch (redux)
Replies: 18
Views: 3692

Re: Is It A Farnsworth... or a Hirsch (redux)

It was a hard cover book, "Philo T. Farnsworth, The Father of Television", by Donald Godfrey.

https://www.amazon.com/Philo-T-Farnswor ... 445&sr=8-3
by Ed Meserve
Sun Jan 19, 2020 4:13 am
Forum: Philo T Farnsworth Archive
Topic: Is It A Farnsworth... or a Hirsch (redux)
Replies: 18
Views: 3692

Re: Is It A Farnsworth... or a Hirsch (redux)

I also brought in my multi-meter to check continuity of the various parts of the cathode. The wire mesh on the larger openings (at least the outer mesh, I didn't think to check the second layer of the inner mesh on the openings) were insulated from the main shell by what looked like ceramics. The me...
by Ed Meserve
Sun Jan 19, 2020 4:04 am
Forum: Philo T Farnsworth Archive
Topic: Is It A Farnsworth... or a Hirsch (redux)
Replies: 18
Views: 3692

Re: Is It A Farnsworth... or a Hirsch (redux)

A Few more Pictures: 20200118_144459.jpg 20200118_144512.jpg 20200118_144618.jpg There was also a book the Museum attendant brought to me with a couple of diagrams of the full assembly, and in the cut away drawing you can see the arrangement of the cathode: 20200118_145847.jpg 20200118_145852.jpg