[Hallicrafters] Sylvania 0A2


mac w7qho at aol.com
Thu Feb 9 21:30:32 EST 2012


Yes, definitely that too.   WAY back I was on a project where we had  
an array of several hundred cold cathode triodes  which we kept   
continuously illuminated with a bank of fluorescent tubes.  Even with  
that we got an occasional misfire.

DD

***************

On Feb 9, 2012, at 4:44 PM, Richard Knoppow wrote:

>
> ----- Original Message ----- From: "mac" <w7qho at aol.com>
> To: "L L bahr" <pulsarxp at embarqmail.com>
> Cc: <dhallam at knology.net>; <hallicrafters at mailman.qth.net>
> Sent: Thursday, February 09, 2012 4:07 PM
> Subject: Re: [Hallicrafters] Sylvania 0A2
>
>
> Makes the firing more reliable, particularly in situations where the
> initial voltage level provided by the circuit is marginal for  
> ignition.
>
> Dennis D.  W7QHO
> Glendale, CA
>
>   I have a somewhat different understanding, namely that the  
> radioactive material is present to insure firing when the tube is in  
> the dark. Light will initiate the ionization but sometimes tubes  
> won't fire in total darkness.
>
>
> --
> Richard Knoppow
> Los Angeles
> WB6KBL
> dickburk at ix.netcom.com



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