Search found 89 matches

by Jim Stead
Tue Sep 29, 2015 3:16 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: X-ray transformer modifications
Replies: 22
Views: 7469

Re: X-ray transformer modifications

Thanks Rich. The new 125kv to Ground is different, as you noted. But, I'm not planning to push the voltage that high. Putting the coils in series is intended to allow a higher duty cycle, while operating at a lower voltage and current than originally designed. The existing 125kv, 300ma rating of thi...
by Jim Stead
Tue Sep 29, 2015 2:42 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: X-ray transformer modifications
Replies: 22
Views: 7469

Re: X-ray transformer modifications

That's good news Richard, thanks. I hear you loud and clear about the connection quality! My plan is to remove the filament transformers at the top to make room for ballast resistors, then join the main coils in series, and set the + side of the rectifier to ground. Although I could use the x-ray ca...
by Jim Stead
Mon Sep 28, 2015 11:43 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: X-ray transformer modifications
Replies: 22
Views: 7469

X-ray transformer modifications

I previously had started a cursory thread on getting this unit - http://www.fusor.net/board/viewtopic.php?f=33&t=10293 Walking through the modifications may be beneficial to someone else someday, so I have started a new thread here. The assembly appears quite clean and the oil looks real good. Trans...
by Jim Stead
Mon Sep 14, 2015 10:29 pm
Forum: New User Chat Area
Topic: Turbo pump startup question
Replies: 4
Views: 1457

Turbo pump startup question

I have a Pfeiffer TPU-060 turbo pump that I want to bring up to full speed to ensure it can get there and sounds okay. The problem I have is my backing pump, which is sick and not pulling below 120 microns. I have to rebuild the backing pump. In the meantime I really need to know about this turbo pu...
by Jim Stead
Tue Sep 08, 2015 8:54 pm
Forum: New User Chat Area
Topic: X-ray machine
Replies: 6
Views: 1960

Re: X-ray machine

I was told it was working before it was disassembled and moved to storage. I am not sure of the polarity, but I have seen references to a similar x-ray head by the same manufacturer which refers to it being center grounded. There are 3 connecting pins for both the cathode and anode. One is common, t...
by Jim Stead
Mon Sep 07, 2015 6:30 pm
Forum: New User Chat Area
Topic: Vacuum Chamber Questions
Replies: 1
Views: 683

Re: Vacuum Chamber Questions

Oliver, Fusion can be accomplished in a 2.75" device. Arcing to the wall is a greater concern in a smaller device, but with the lower voltages you need for basic Fusion it's manageable. SS is a better option than Aluminum, since Aluminum can outgas for a long time. Also, if you do get to voltages wh...
by Jim Stead
Mon Sep 07, 2015 5:40 pm
Forum: New User Chat Area
Topic: X-ray machine
Replies: 6
Views: 1960

X-ray machine

Universal 325 X-ray machine I have an opportunity to buy this working x-ray machine. The price is very good compared to what I see transformers alone going for. The control circuits on this are simple, which would make fusor (or other) modifications that much easier. Looks like the transformer is 60...
by Jim Stead
Sat Aug 22, 2015 8:54 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Black Mineral Oil
Replies: 6
Views: 2617

Re: Black Mineral Oil

There isn't any way to know for sure without a chemical test. However, according to Wikipedia GE had a stinky PCB oil - "Pyranol/Pyrenol, Chlorinol (widely used in GE's oil-filled "chlorinol"-branded metal can capacitors, detected by a pungent characteristic odor released by them (especially when th...
by Jim Stead
Sat Aug 22, 2015 8:01 pm
Forum: Please Introduce Yourself
Topic: Hello everyone
Replies: 1
Views: 772

Hello everyone

http://i1.cpcache.com/product_zoom/120828083/hello_my_name_is_jim_keepsake_box.jpg?height=250&width=250&padToSquare=true I've always been interested in nuclear physics, although I haven't put much time or study into it. I've stopped by this site a number of times over the last few years, saying to ...