...snip...
(Carl:)
>>>... I believe that you, Rich and others already agree that
>>> the instantaneous discharge can add many amps to the equation.
(Tom Rauch:)
>>No, only a fractional amperage increase. The saturated emission
>>current of a thoriated tungsten 25 watt filament is three amperes or
>>less. That current must be integrated over time to cause heat, plus
>>it is the PEAK current. The effective heating would be the time
>>integrated value of this RF current. If driven by a sine wave, the
>>heating would be .707 times 3 amperes, or 2.1 amperes times the
>>resistance. If the conduction waveshape was the same as a typical RF
>>PA, the current considered for heating would be less than 1/3 the
>>peak current, or under one ampere.
>Very wrong again Tom. You are staying completely hung up in "proper" tube
>performance and there you are correct.
>What you refuse to admit is that an instantaneous discharge is a function
>of the voltage and current and has absolutely no bearing on the design
>parameters of the tube.
Yes indeed, Carl It seems that expert science is taking a backseat to
"expert" status.
...snip...
>>The analysis would prove nothing except the filament got hot. It is
>>impossible to determine the cause of the heating after the fact.
The post-'big-bang' 811A broken filament fragments I have seen appeared
to be identical to broken filament fragments in an 811A that was
accidentally dropped.
...snip...
>The only gas around this discussion is pure methane flatulence.
Arcs and methane gas are not a good combination, Carl.
>73...Carl KM1H
Rich---
R. L. Measures, 805-386-3734, AG6K
--
FAQ on WWW: http://www.contesting.com/ampfaq.html
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
|