Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: Valvo E88CC/6922 question. posted by Sigmund on January 10, 2004 at 10:25:04:
here it is from the website>
> William, Valvo used five colour codes for labeling. These are:
>
> white - general purpose, consumer applications
> > general reliability, medium tolerance and life expectancy
>
> red - industrial control, professional services
> >long life and reliability, close tolerances, shock and impact
proof
> (usually three micas and other reinforcing measures),
> interference-free special cathodes
>
> yellow - PTW applications, this includes everything were tubes are
> located in remote/inaccessible areas
> >long life and reliability, close tolerances; no need for shock and
> impact proofing as well as interference-free cathodes in these
> applications
>
> green - calculator/computer use
> >long life and reliability, close tolerances at certain
characteristic
> points, interference-free special cathodes; no need for shock and
> impact proofing in these applications
>
> blue - navy and airforce applications
> >reliability, close tolerances, shock and impact proof (usually
three
> micas and other reinforcing measures), interference-free special
> cathodes, filament impervious against repeated turn on/off cycles.
> Interesting to note that the armed forces did not specify extended
> lifes of their tubes!
>
> Common for all colour branded tubes is their long life of >10k/h,
even
> if not specifically mentioned.
>
> /Dieter
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Follow Ups
- Re: Valvo E88CC/6922 question. - clubmyke 00:46:57 01/11/04 (1)
- Re: Navy retubing - MrTanner 04:30:16 01/11/04 (0)