>It was proposed that the change in geometry was a result of
>'excessive' DC current. If you take the tube out of the socket,
>create a short, and look at the current during this experiment,
>you have a better handle on it's possible contribution to the
>observed physical changes in your tube.
The grid-fil current is virtually zero. A grid-fil short does not burn
out the choke.
>
>If the chokes are all burnt in the same spot it might be AC...
The chokes are 1mH.
>of the same frequency in every case...
>then again, the wire might be thin in that spot on all the chokes :-)
>
>
>-bob
>ah7i
>
>
>2 wrote:
>
>>
>>
>>>Classic divide and conquer analysis...
>>>
>>>You want an upper bound on the current.
>>>Take the effing tube out of the circuit and
>>>measure the peak current that pops your choke.
>>>
>>>Do this by simulating the 'event' (short in tube)
>>>with a relay.
>>>
>>>
>>
>>^^ A short in the tube does not blow the choke. I simulated a
>>grid-filament 3-500Z short with a clip lead, and the result was a
>>unspectacular rise in DC anode current. The choke did not implode or
>>burn out.
>>
>>
>>>This will tell you if all the other speculation
>>>is within the realm of reason or Bull Shit.
>>>
>>>Depending on what you measure, you might
>>>end up with a clue as to eggs before chickens
>>>or the other way around...
>>>
>>>-Bob
>>>ah7i
>>>(It is eggs before chickens, from an evolutionary POV)
>>>
>>>
>>>
>>>On Sun, 9 Feb 2003, 2 wrote:
>>>
>>>
>>>
>>>>The trick is to have the scope connected when an event takes place --
>>>>which could be once in maybe a year or eight.
>>>>
>>>>
>>>>
>>>>>Why speculate? If you've a storage scope or a
>>>>>scope with triggered sweep amd a camera
>>>>>it's easy to measure the destruction of that
>>>>>28 guage choke and get a handle on the
>>>>>upper limit of that current.
>>>>>
>>>>>-bob
>>>>>ah7i
>>>>>
>>>>>
>>>>>2 wrote:
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>Jeffrey Madore wrote:
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>As I alluded to, I think we can leave the terrestrial magnetic field
>>>>>out of the equation.
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>That is clear from Eric's calculation.
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>A length of power cable in free air exhibits the property of inductive
>>>>>reactance when there is AC current flow. This XL results when the
>>>>>cables own magnetic field expands and collapses about the conductor
>>>>>itself. The result is a CEMF which produces current that is out of
>>>>>phase with the source current and thus bucks or impedes the flow of
>>>>>current from the source. Hence, we have these two current components
>>>>>which are out of phase, producing magnetic reaction and mechanical
>>>>>
>>>>>
>>force.
>>
>>
>>>>>
>>>>>
>>>>>
>>>>>If you can describe the scenario, you can predict the force. Please may
>>>>>we see a calculation?
>>>>>...
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>** not until someone measures the currents present during the event that
>>>>>preceeds a 3-500Z fil/grid short. So far, the only quantity we can guess
>>>>>at is the >15a it takes to melt #28 Cu in the grid's DC return path.
>>>>>
>>>>>- 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
>>>>
>>>>_______________________________________________
>>>>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
>>
>>_______________________________________________
>>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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