Re: [Bulk] Re: [TCML] ANOTHER ONE DOWN, ANOTHER 37667 BITES THE DUST

[Neon Tesla <neontesla@xxxxxxxxx>]

Hate to sound like a broken record...
May I inquire as to where you got your 31915 Maxwells?

On Sun, May 13, 2012 at 8:55 PM, drieben <drieben@xxxxxxx> wrote:

> I got my Hipotronics caps (2) from the one and only Jeff Parisse
> of KVA Effects himself. Cameron ended up talking me out of
> one of them and then he also purchased one from Ed Wingate
> at one of his Teslathons. Both Cameron and I now use those
> .1 uFd, 75 kV rated #31915 Maxwells that I was mentioning,
> since we've both suffered a failure with the Hipotronics caps
> amd my Hipo units were both brand new when I got them.
>
> David Rieben
>
>
> ----- Original Message ----- From: "Neon Tesla" <neontesla@xxxxxxxxx>
>
> To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> Sent: Sunday, May 13, 2012 8:56 PM
> Subject: Re: [Bulk] Re: [TCML] ANOTHER ONE DOWN, ANOTHER 37667 BITES THE
> DUST
>
>
>  Where did you get those Hipotronics caps?
>> As a product of this conversation I too just learned
>> my 37667 was useless for my soon to be finished
>> 8 inch system :' (
>>
>> On Sun, May 13, 2012 at 7:33 AM, drieben <drieben@xxxxxxx> wrote:
>>
>>  Hi Adam,
>>>
>>> Yes, the 35 kV rating of these 37667 units seems to
>>> really be "running on the razor's edge" for failure when
>>> pushing voltages  > 12 kVAC and seriesing them in
>>> 2's for a 70 kV rating does seem to properly address
>>> this issue. From what I've been able to gather, I would
>>> opt for a capacitor voltage rating at a minimum of 3x
>>> the maximum AC RMS voltage that is anticipated from
>>> the transformer. Both Cameron Prince and I have expe-
>>> rienced failure with a .1 ufd, 50 kV rated Hiptronics
>>> pulse cap in our large Tesla coils, driven by a 14.4 kV pig,
>>> that was overdriven to 16.8 kV through variacs. That
>>> would place the Hipotronics unit right at the 3x rule with
>>> a 16.8 kV(AC) input. After switching to a 75 kV rated
>>> Maxwell unit, we've experienced no more problems.
>>> The > 3x voltage rating provides a safety cushion for the
>>> very high voltage reversals experienced in a Tesla coil
>>> circuit.
>>>
>>> David Rieben
>>>
>>>
>>>
>>>
>>>
>>> ----- Original Message ----- From: "Yurtle Turtle" <yurtle_t@xxxxxxxxx>
>>>
>>> To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
>>> Sent: Sunday, May 13, 2012 4:35 AM
>>> Subject: [Bulk] Re: [TCML] ANOTHER ONE DOWN, ANOTHER 37667 BITES THE DUST
>>>
>>>
>>>
>>> I have used 10 in series/parallel for over a decade in 25 kVA use on a
>>> 10"
>>> coil and they are still fine. I bought them in at least four different
>>> "buys", so who knows the abuse they suffered before me, but they have
>>> performed admirably, as long as you use two in series.
>>>
>>> Adam
>>>
>>> ______________________________****__
>>>
>>> From: MICHAEL HARDY <mhardy4@xxxxxxxxx>
>>> To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
>>> Sent: Saturday, May 12, 2012 11:15 PM
>>> Subject: [TCML] ANOTHER ONE DOWN, ANOTHER 37667 BITES THE DUST
>>>
>>> When I first decided to build a pig powered coil (2004 ), I searched for
>>> pulse caps on the internet, and of course the infamous 37667's were
>>> everywhere. Bought 5 at $100 each. Then found out they weren't very good
>>> for TC's. I've since been running 3 TC rated Maxwell 0.2uF, 20 kV caps in
>>> series, for 0.066uF @ 60kV. This on a 14.4 kV Pt powered 6" coil system
>>> running around 4800 watts with no problem. I have recently completed a
>>> 15"
>>> coil running at about 15 kW. I used 2 banks (including the one above) in
>>> parallel for 0.14 uF at 60 kV. I still am running the smaller coil
>>> routinely. Changing out one bank is a pain, so decided to try a pair of
>>> 37667's in parallel (0.06 uF @ 35kV). Ran good with only slight warmth to
>>> cases of caps. Short 30 sec runs with 3 minute pauses. After a half hour
>>> I
>>> saw steam from the cap bank. Checked, and one of them had split open.
>>> DON'T
>>> BUY 37667 MAXWELL'S FOR TC USE!
>>> ______________________________****_________________
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>>>
>>>
>>
>>
>> --
>> *Don't lower your expectations, raise the voltage !*
>>
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>>
>
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>



-- 
*Don't lower your expectations, raise the voltage !*
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