Interestingly that was the first thing I bought.
Just received my 2nd identical 15060P NST so getting ready to text it on my first with the Jacobs ladder
Tim
> On Feb 21, 2015, at 9:41 AM, twoten <teslafirma@xxxxxxxxx> wrote:
>
> I think that the very first thing you should do is spend 5 bucks on the
> tesla coil design software called TeslaMap. It's invaluable and will
> answer so many of your questions.
>
>
>> On 15-02-21 06:26 AM, Timothy Gilmore wrote:
>> Gary,
>>
>> Sounds like a pretty scary adventure veering off from the plans I have
>> which indicate simple things such as just adding more capacitance. I think
>> what I will do first is get a working single NST tesla coil first
>> (15kv/60mA) and using the 2nd NST as a backup incase the first ever gets
>> fried. If it looks like the design is stable than perhaps later on I will
>> take on a 2 NST new design. Its been 35 years since I built my first and so
>> much great development has happened and new ideas learned by the smart
>> people here and other places in the Tesla Coil world. Thanks again for your
>> insight and the others here that make this such a fun hobby.
>>
>> Tim
>>
>>> On Fri, Feb 20, 2015 at 8:02 PM, Gary Lau <glau1024@xxxxxxxxx> wrote:
>>>
>>> The only reason to have transformers be identical is a matter of
>>> aesthetics. As long as the output voltage is remotely similar, one can mix
>>> France, Jefferson, whatever, flavors of NST's, if the phasing is correct,
>>> and you'll know immediately if it's wrong. It's _nice_ to have them
>>> identical but functionally unnecessary.
>>>
>>>> There would be a lot more changes than just caps and gaps.
>>> I would like to amplify the above point. Assuming you want to do
>>> everything needed to extract the maximum arc length from the additional
>>> power at your disposal, repeat over and over - Bigger is Better. You'll
>>> want a larger top load, and you'll want a taller secondary to space the top
>>> load farther from the primary to avoid strikes to it. The larger top load
>>> and secondary will require a significantly larger primary, not just another
>>> couple of turns. I ended up building a 2-layer primary to keep
>>> the dimensions sane. Higher inductances and lower frequencies are all
>>> good!
>>>
>>> Also, a 15/120 power supply is probably going to push the limits of what a
>>> static gap can handle. You didn't mention what you're planning for a gap
>>> but you might wish to consider a rotary. I highly recommend the propeller
>>> gap configuration - http://www.laushaus.com/tesla/sync_gap.htm If you're
>>> thinking about a synchronous rotary, the capacitor size needs to be much
>>> higher than for a static gap, and will require comparably more primary
>>> inductance.
>>>
>>> And, a 15/120 power supply is going to pull a LOT of juice from the wall -
>>> you'll want to make sure you have an adequate PFC capacitor to minimize
>>> current draw. My single 15/60 pulls in excess of 20A with a sync rotary
>>> and 240uF of PFC caps.
>>>
>>> Bottom line - you should plan from day 1 what the final configuration is
>>> going to be - you'll not be able to go back and forth with 1 or 2 NST's.
>>>
>>> Regards, Gary Lau
>>> MA, USA
>>>
>>>
>>>
>>>
>>>
>>> On Fri, Feb 20, 2015 at 1:32 PM, Timothy Gilmore <tdg8934@xxxxxxxxx>
>>> wrote:
>>>
>>>> Great videos on Phasing (both parts 1 and 2). I will watch those again
>>> when
>>>> ready to set up.
>>>>
>>>> On Fri, Feb 20, 2015 at 9:36 AM, John Paul Grippa <pupman@xxxxxxxxxxxx>
>>>> wrote:
>>>>
>>>>> There is a great video from the Geek Group on YouTube that explains how
>>>>> this works extremely well. It will also give some good tips on how to
>>>>> ensure proper phasing. Check it out!
>>>>> https://www.youtube.com/watch?v=KSlQjw9OPG4
>>>>>
>>>>>
>>>>>> Date: Fri, 20 Feb 2015 08:26:17 -0600
>>>>>> From: tdg8934@xxxxxxxxx
>>>>>> To: tesla@xxxxxxxxxx
>>>>>> Subject: [TCML] Dual identical FRANCE neon sign transformers (15000v
>>>>> 60mA each) in parallel
>>>>>> I currently have a France NST at 15kv 60mA and built a nice jacobs
>>>> ladder
>>>>>> with it. Yesterday on eBay I found what looks to be identical model
>>> NST
>>>>> for
>>>>>> a good price (no GFI). From what I have read about NST phasing,
>>> having
>>>>>> identical NSTs don't require testing the HV outputs and I should be
>>>> able
>>>>> to
>>>>>> connect them up in parallel identically using the same sides. What a
>>>>> jacobs
>>>>>> ladder at 120mA would be! Anyway I'm assuming that I should start
>>>>> building
>>>>>> my tesla coil with 1 NST and when it works add the next NST in
>>> parallel
>>>>> and
>>>>>> double the capacitors and change the tap on the primary. Does this
>>>> sound
>>>>>> like all I would need to do?
>>>>>>
>>>>>> Thanks - Tim
>>>>>> _______________________________________________
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