>I have just spent an entire semester working on electro magnetism and the
>physics is VERY fresh in my mind. Eric's calculations are sound, I am sorry
>Rich but you are way off the mark here, there is no way that sufficient
>magnetic flux could have been generated in the scenario you describe.
>Certainly nowhere near enough to distort the grid wires as you have
>suggested.
>
>I suggest that you re-think this one. I can quote some equations at you if
>you wish.
>
** I need some measurements during the big-bang that preceeded a
grid-fil short.
>Regards
>
>Conrad G0RUZ
>
>-----Original Message-----
>From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com]On
>Behalf Of Ian White, G3SEK
>Sent: 04 February 2003 14:54
>To: amps@contesting.com
>Subject: Re: [Amps] Re: Voodoo "EMF' forces from grid current pulses
>
>
>2 wrote:
>>The grid wires in all of the shorted 3-500Z and 3-400Z tubes that I
>>have autopsied appear to be straight. I have never seen a bent grid.
>>The bent element is the thoriated-tungsten filament helix.
>>
>>>you will have to come up with another mechanism, one that can generate
>some
>>REAL
>>>force.
>>>
>>There is no doubt that real force did the bending because real force is
>>required to bend a bent filament straight. It typically takes 11-G for
>>c. 40-seconds, with the filament operating at c. 5.6V, to straighten
>>the
>>filament.
>
>Fine - so where *did* the force come from that bent it? Eric has just
>shown that the EM force between two parallel wires is about 1/1000 of an
>ounce for the conditions he assumed (two 1in wires separated by 1mm,
>each carrying 10A). Even if you dispute the value of the current, you're
>still adrift by several orders of magnitude.
>
>>- Eric -- How do you explain:
>>1. the grid-filament short often seen in 3-500Zs often follows a
>>big-bang?
>
>And just before the event, the grid and filament were already how close?
>Nobody knows, because only totally dead tubes are ever autopsied.
>
>>2. the simultaneous burnout of a grid choke made from 28ga Cu wire?
>>
>That shows that considerable grid current had flowed - but nothing more.
>You still don't know whether the blown choke and the grid-filament short
>were both caused by the "main event" at the same time; or whether that
>event only caused the grid-filament short, which then blew the choke as
>a follow-on.
>
>Also there is conflicting evidence. On the one hand, enough grid current
>has flowed (somehow) to burn out the choke. On the other hand, it's not
>the grid that has bent - it's the filament.
>
>
>I'm sorry, but the evidence about this whole topic certainly does *not*
>"speak for itself"... at least, I can't hear the voices :-)
>
>We're back again to the limitations of autopsy evidence, and the need to
>sometimes return an Open Verdict.
>
>
>--
>73 from Ian G3SEK 'In Practice' columnist for RadCom (RSGB)
> Editor, 'The VHF/UHF DX Book'
>http://www.ifwtech.co.uk/g3sek
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>http://lists.contesting.com/mailman/listinfo/amps
>
>
>_______________________________________________
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>Amps@contesting.com
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>
- R. L. Measures, a.k.a. Rich..., 805.386.3734, AG6K,
www.vcnet.com/measures.
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