>I like this discussion;
Many of the denizens on AMPS find discussions of parasites odious. The
only semi-plausible explanation to bent filaments is that some Hams are
using their 3-500Z amplifiers in aerobatic airplanes - or operating them
roller-coaster mobile.
Cheers, K. E.
>I hope everyone involved remains objective in their
>responses. I have no doubt whatsoever that Rich has seen what he claims,
>yet his proposed physical process so far seems not to fully explain the
>mechanism behind what he's seen. This is a common occurrence in my field,
>where we often see events generated by unknown processes. Many theories are
>proposed and Occam's Razor slowly whittles them down to those that are both
>simplest and most plausible (this process does not always reduce the number
>of candidates to one, however). I'm curious about what physical
>mechanism(s) will result form this process.
>
>Kim Elmore, N5OP
>
>At 02:54 PM 2/4/2003 +0000, you wrote:
>>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
>>_______________________________________________
>>Amps mailing list
>>Amps@contesting.com
>>http://lists.contesting.com/mailman/listinfo/amps
>
> Kim Elmore, Ph.D.
> University of Oklahoma
> Cooperative Institute for Mesoscale Meteorological Studies
>"All of weather is divided into three parts: Yes, No, and Maybe. The
>greatest of these is Maybe" The original Latin appears to be garbled.
>
>_______________________________________________
>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.
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