>Point taken about the poor magnetic shielding of amp chassis. I did not mean
>to imply that the tubes were immune to the Earth's magnetic field but that
>the currents flowing are not of sufficient magnitude, the peak currents in
>welding cables are far greater. Rich do you have any photos?
** of imploded pi section chokes with melted wire?
>If so please
>send me them, I am going to ask one of the professors at the University
>about this to see if he can offer any explanation.
>
>Conrad
>
>-----Original Message-----
>From: 2 [mailto:2@vc.net]
>Sent: 07 February 2003 12:06
>To: conrad@g0ruz.net; AMPS
>Subject: RE: [Amps] Re: Voodoo "EMF' forces from grid current pulses
>
>
>
>
>>This can be easily explained, the welding cables are subject to the earths
>>magnetic field and any other localised magnetic fields, that's why they
>jump
>>about.
>
>Tubes are immune to Earth's magnetic field ?
>
>>The question is, would this happen in a shielded enclosure (amp
>>chassis) and with the magnitude of current flowing in the grid during a
>>fault condition? I am still sceptical. One thing's for sure, something
>>happens, but what?
>
>Good question. What is the fusing current of #28 Cu ? It must be at
>least 15A, and yet the 3-500Z cathode/filament is theoretically not
>capable of such a preak emission.
>>
>Any ideas, Conrad?
>
>>-----Original Message-----
>>From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com]On
>>Behalf Of Jeffrey Madore
>>Sent: 07 February 2003 04:24
>>To: 2; MorgusMagnificen@aol.com; AMPS
>>Subject: Re: [Amps] Re: Voodoo "EMF' forces from grid current pulses
>>
>>
>>
>>>
>>> >I strongly challenge this assertion. I know of no mechanism within the
>>realm
>>> >of classical EM field theory to account for this. I am assuming you are
>>> >referring to the normal force that would accompany two current-carrying
>>> >conductors which are in parallel proximity to each other.
>>> >
>>> Have you ever been to a welding shop and observed what happens to
>>> arc-welder cables when an arc is struck? I have and I saw the cables
>>> jump about on the floor.
>>
>>Yea verily, Rich!
>>
>>In my past life I did high current trip testing on 480 volt circuit
>>breakers. 50,000 amps was not unusual but even much lower currents would
>>make welding cables jump off of the floor.
>>
>>I remember experimenting with a fairly large 480/120 3 phase lighting
>>transformer, with a dead short on the secondary and 208 volts applied to
>the
>>primary via a pretty large motor control contactor and momentary push
>>button. It was a "hit the button while peaking around the corner" type of
>>experiment. We were able to draw about 2000 amps momentarily on the
>>secondary which really made a set of welding cables jump.
>>
>>In my experience, a single conductor doesn't need any other conductor near
>>it to display mechanical force when high current is applied. The self
>>inductance of the cable and resulting cemf produce sufficient magnetic
>>reaction to make the cable jump if it is not secured. Very interesting to
>>look at the Z of a 4/0 welding cable...
>>
>>I've often found that if our engineering theories couldn't explain what
>>appeared to take place in reality, then we needed to look deeper into the
>>matter.
>>
>>73, Jeff - K1LE - CT
>>
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>>http://lists.contesting.com/mailman/listinfo/amps
>>
>>
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>>
>
>
>- R. L. Measures, a.k.a. Rich..., 805.386.3734, AG6K,
>www.vcnet.com/measures.
>end
>
>
>
>_______________________________________________
>Amps mailing list
>Amps@contesting.com
>http://lists.contesting.com/mailman/listinfo/amps
>
- R. L. Measures, a.k.a. Rich..., 805.386.3734, AG6K,
www.vcnet.com/measures.
end
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