I'll try and manually type the address. I had this happen before, years ago. It seemed like it was a Yahoo thing.
https://i.imgur.com/ho4P2Z7.jpghttps://i.imgur.com/PTjK6nk.jpg
On Saturday, June 23, 2018, 8:42:49 PM EDT, David Rieben <drieben@xxxxxxx> wrote:
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 iPhone
>
>> On 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
>>> potted
>>> in 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 epoxy
>>> specific for the context. Rectified DC off an NST is a different beast
>>> and
>>> kinda scary for me :)
>>>
>>> I was using this to drive a VDG, but the voltage was too high and it's
>>> very
>>> much 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
>>>> safe
>>>> grounding, it's all been instructive for a noob
>>>>
>>>> I have this grey resin block neon transformer in the shed I was
>>>> thinking
>>> of
>>>> experimenting 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 and
>>> use
>>>> 4 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 it
>>> out a
>>>> bit.
>>>>
>>>> Then I was wondering if there was another way to do it with a midpoint
>>>> grounded transformer like mine. I'm thinking the 2 secondary windings
>>>> on
>>>> the transformer must be out-of-phase, but could I rectify them
>>>> individually? Between each HV output and the midpoint ground I mean.
>>> Then
>>>> I'm thinking I'd need 2 bridges but they're only trying to rectify half
>>> the
>>>> voltage 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 capacitor
>>> that
>>>> doesn't have to be rated for the highest voltage (so I can put less
>>>> caps
>>> in
>>>> series)
>>>>
>>>> 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
>
_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxxxxxxxxxx
https://www.pupman.com/mailman/listinfo/tesla
