Search found 1303 matches

by John Futter
Sun Sep 13, 2020 7:15 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: RF superimposed on HVDC
Replies: 3
Views: 908

Re: RF superimposed on HVDC

Look at how the output tube in ham linear amplifiers feed the anode of the output tube. The DC isolation choke is quite special and is designed so as not to have any resonances in the rf pass band of the amplifier. This done by seriesing several inductors of differing vaues usually on the same forme...
by John Futter
Sun Sep 13, 2020 7:08 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Restarting Efforts on Demo Fusor II
Replies: 27
Views: 3623

Re: Restarting Efforts on Demo Fusor II

Most farm dairy supply stores carry milking rubber. This is what connects the milking claw to the main vacuum pump and pulsator.
Common sizes are half three quarter and one inch bore sizes --sold by the yard and very suitable for backing lines
by John Futter
Sat Sep 12, 2020 7:39 pm
Forum: Items For Sale
Topic: Scientifice Vacuum Item Auction
Replies: 3
Views: 902

Re: Scientifice Vacuum Item Auction

Nicolas item P19115 is the main PSU for the TEM the big blue things at the bottom of it are the screened transformers. The big one is the 48 volt dc rail transformer all of this circa late seventies to the end of the eighties. This item was used with the 100kV HT modules on Phillips SEM and TEMs. As...
by John Futter
Thu Sep 10, 2020 7:11 pm
Forum: Items For Sale
Topic: Philips High Tension Generator 100Kv
Replies: 7
Views: 995

Re: Philips High Tension Generator 100Kv

Richard
I'm pretty sure it will not take to being variac driven
The box on top is powered from the 48 volt DC rail core inside box is edt type probably 3C90 material
There was also mechanical switching within the tank I know I had trouble with one of the switches in one of my tanks
by John Futter
Thu Sep 10, 2020 4:26 am
Forum: Items For Sale
Topic: Philips High Tension Generator 100Kv
Replies: 7
Views: 995

Re: Philips High Tension Generator 100Kv

No they are about a 100lbs oil filled with the drive transformer and electronics sitting in the box on top
interior of tank oil filled with multiple transformers in series for the filament supply and a large full wave cockcoft walton for the HV
by John Futter
Wed Sep 09, 2020 6:55 pm
Forum: Items For Sale
Topic: Philips High Tension Generator 100Kv
Replies: 7
Views: 995

Re: Philips High Tension Generator 100Kv

For anybody who buys this
I have some circuitry info on the 70kV version that is in the same exact box
I just threw the two 70kV units i had out
by John Futter
Wed Sep 09, 2020 6:51 am
Forum: Images du Jour
Topic: Caden Burkhardt-Fusor Progress
Replies: 27
Views: 4468

Re: Caden Burkhardt-Fusor Progress

Robert
While we are at it
could you please edit your profile so that you are Robert Virkus as the rules state not just Robert
Thank you
by John Futter
Sat Sep 05, 2020 2:21 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Questions about HV rectifier
Replies: 35
Views: 3365

Re: Questions about HV rectifier

Tony
Excellent you are learning!!
by John Futter
Thu Sep 03, 2020 7:05 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Questions about HV rectifier
Replies: 35
Views: 3365

Re: Questions about HV rectifier

Tony please do not repeat what others have written in your replies
we can all read what has transpired before your post
by John Futter
Wed Aug 26, 2020 8:09 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: NIM Power Supply Fix
Replies: 18
Views: 2247

Re: NIM Power Supply Fix

Aidan there are not many components you can check all resistors with a DMM look for carbon ones that have gone high in value cap lift an end and measdure capacitance transistors use the DMM diode function to check BE BC EC CE you still need to try and find where thr three wires from the pot should g...