[AMPS] heating tubes....

[Ian White, G3SEK]

measures wrote:
>€  I have tested many metal anode-cooler 3-500Z tubes that g/fil. shorted 
>after a big-bang.  The majority had under 3uA of grid/anode leakage at 
>8000v.  The subsequent autopsies revealed no arc marks on the grid.  

The reasons for observing low gas currents if you delay more than a few
seconds after the event have been explained many times - "it's the
gettering action".

Does testing 3-500Zs cause amnesia? 

73 from Ian G3SEK          Editor, 'The VHF/UHF DX Book'
                          'In Practice' columnist for RadCom (RSGB)
                           http://www.ifwtech.com/g3sek

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