If you sputter enough metal onto any insulator, you can make it conduct.

On Tuesday, August 30, 2016 at 1:28:06 PM UTC-7, j....@my-deja.com wrote:
>
>  I think this is improbable.  On the one tube that I dissected*, the back 
> substrate is an insulating white ceramic with an insulating  black ceramic 
> overcoat.
>

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