Adam,I would assume that your 150 kV, 1 amp rated diodes were removed from an x-ray transformer as well, as that's a common size/rating for x-ray tranny rectifiers. They are often a phenolic or garolite stick with a few dozen seriesed diodes soldered to them. Of course, the ONLY way that one could approach their 150 kV ceiling would be to have them completely submerged in dielectric oil, just as they are inside an x-ray transformer. They work fine for rectifying the relatively "low" voltage from an NST in open air, though.
David----- Original Message ----- From: "Yurtle Turtle via Tesla" <tesla@xxxxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx> Sent: Saturday, June 23, 2018 2:39 PM Subject: Re: [TCML] rectifying my NST
I used these on my 15 kV 120 ma NST. I think they are rated 150 kV 1 amp. Imgur | | | | | | | | | | | Imgur Imgur: The magic of the Internet | | |On Saturday, June 23, 2018, 8:50:18 AM EDT, David Rieben <drieben@xxxxxxx> wrote:Charles,Wow! 36” spark! That’s impressive. I happen to have a surplus x-ray transformer (with its internal diodes still intact) that I currently already have set up to be fed with the current ballasted 0 - 280 VAC output from my large Tesla coil control panel that would serve admirably for feeding a ‘man-sized’ Marx generator. I have toyed with the idea of building a big Marx bank before, but the challenge of its sound construction, both from an electrical as well as a mechanical standpoint, the unlikely prospect of procuring all of the required matching HV Caps and resistors on the surplus market and the consequential cost associated with obtaining the same on a retail market, and the total lack of space to safely operate such a beast have pretty well placed that project on the back burner for now. :-/David Sent from my iPhoneOn Jun 22, 2018, at 8:26 PM, charles rakes <crakes29@xxxxxxxxx> wrote: I use a 15Kv 60ma NST with 30 diodes in series on each output hot terminal. One string with a negative output and the other with a positive. I get over 22KV DC output that I use to drive my dual 15 stage Marx generator and get about 36-inches spark between the two towers. The NST's primary is controlled by a variac. On Fri, Jun 22, 2018 at 2:14 PM, Matthew Sweeney <msweeney23@xxxxxxxxx> wrote:Hi Raymond, I did this using strings of cheap Microwave oven diodes pottedin short PVC tubs with paraffin wax. I also added some high wattage 1M resistors for my own safety. Basically I created large, clunky, cheap 30KV-50KV diodes :) It worked well, but I think the diodes would be better off in epoxyspecific for the context. Rectified DC off an NST is a different beast andkinda scary for me :)I was using this to drive a VDG, but the voltage was too high and it's verymuch overkill! Good luck!On Fri, Jun 22, 2018, 5:35 AM Raymond Spigot <raymond.j.spigot@xxxxxxxxx>wrote:Hi, thanks for all the interesting discussion about NST testing and safegrounding, it's all been instructive for a noobI have this grey resin block neon transformer in the shed I was thinkingofexperimenting with. It's a 15kv/30mA one with a midpoint ground connection. Is there a way to rectify the output so I can use it for trying out powering a dc tesla? I have a big bag of diodes (1N5408 I think) that were pretty cheap. If they'll handle 1000v each I could solder them up into long strings anduse4 strings of diodes to make a bridge rectifier? I guess I'd need a capacitor on the other side of the bridge as well though to smooth itout abit. Then I was wondering if there was another way to do it with a midpointgrounded transformer like mine. I'm thinking the 2 secondary windings onthe transformer must be out-of-phase, but could I rectify them individually? Between each HV output and the midpoint ground I mean.ThenI'm thinking I'd need 2 bridges but they're only trying to rectify halfthevoltage each and it would be easier to cope with. Basically I'm hoping there's a way to get like 10kv dc out instead of closer to (I think) 20kv Because then I can buy a main MMC capacitorthatdoesn't have to be rated for the highest voltage (so I can put less capsinseries) hope this makes some sense to someone! thanx for advice anyway Ray _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxxxxxxxxxx https://www.pupman.com/mailman/listinfo/tesla_______________________________________________ Tesla mailing list Tesla@xxxxxxxxxxxxxxxxxx https://www.pupman.com/mailman/listinfo/tesla_______________________________________________ Tesla mailing list Tesla@xxxxxxxxxxxxxxxxxx https://www.pupman.com/mailman/listinfo/tesla_______________________________________________ Tesla mailing list Tesla@xxxxxxxxxxxxxxxxxx https://www.pupman.com/mailman/listinfo/tesla _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxxxxxxxxxx https://www.pupman.com/mailman/listinfo/tesla
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