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

[Neon Tesla <neontesla@xxxxxxxxx>]

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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