[R-390] Testing tubes r392

[Randy and Sherry Guttery]

On 8/6/2012 11:47 AM, rbethman wrote:
> The TV-10 is just fine.  However, I'll stick with the later WE labeled
> Hickok LS-1XXXXX series.  It adjusts to the line voltage, and reads
> directly in mhos.
So does the TV-10...    The Hickok 600 series - and BTW - 
you did mean KS-xxxx series?
> There is one flaw in "blasting crud" off tube elements by "heavy"
> current blasts.  The one element that may "need" this is the filament.
> This would occur in Thoriated tungsten filaments.
Don't know what you're referring to...  the blast I'm 
talking about is to hold down the P3 emission test (to apply 
normal test voltages) then just *ever* *so* *lightly* *just* 
*tap* the OZ3 button... You'll get a boost of HV (meant to 
fire the gas in an OZ) which will "hopefully" arc the crud 
off the elements without opening them up. This "method" is 
what was used by the old CRT "Beamer" devices of the 50s and 
early 60s.  Again - should be applied to a tube that is 
otherwise already shot - as if it rips a grid - (which can 
and does happen) - then the tube is a paper-weight. Again - 
as noted - this is a voltage blast - hopefully so short the 
arc doesn't burn "through" stuff...

-- 
randy guttery

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