>2 wrote:
>>> 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,
>
>Exactly 15A - good guess! However, a significantly larger current would
>be needed to fuse #28 wire with the single short pulse we're talking
>about here.
>
>>and yet the 3-500Z cathode/filament is theoretically not capable of
>>such a preak emission.
>
>You may have answered your own question - electron emission isn't enough
>to supply the current required. An arc from anode to grid is easily
>capable of much more peak current than 15A, limited essentially by the
>power supply components.
** good point, however, I have not yet found an arc-mark on the grid
cage of a 3-500Z with a bent filament helix that shorted against the grid
cage. Nor have I found an anode-grid withstanding potential of under
10kV in such a tube prior to autopsy.
>
>--
>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
>
- R. L. Measures, a.k.a. Rich..., 805.386.3734, AG6K,
www.vcnet.com/measures.
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