[TenTec] 3-500Z

[JEFF S JOHNSON]

Sorry Phil, I don't have a source for you ( May want to try 'RF Parts' ) 
but I do have a question to anyone about the 3-500Z.  A few months ago I
was into my Centurion cleaning and inspecting and noticed the tubes have
a silver coating around the lower part of the glass on the inside. I
can't see it when the tubes are on but when the filaments are off and
outside light source is used . This amp is about 3 years old and not used
all that much maybe 10 hours a month tops and generally don't run over 1
kw out. I've not noticed any drop in output or change in loading. Just
wonder if this is normal ageing or something to worry about. I have a few
older tube rigs that I know have this silver color in them, more than
just around the getters, and some are almost black but I never knew if
this was a sign of a weak tube or not.   

Thank you all, 73   Jeff  AA8VE



On Wed, 6 Oct 1999 09:00:38 -0500 psmith@indian.vinu.edu writes:
> 
> 
> 
> Where can I get a good price on a pair of 3-500Z tubes?
> 
> Phil, AA9ZZ
> 
> 
> 
> 
> 
>                      .- .-  ----.   ..   ..
>                          Phillip Smith
> 
>                       Vincennes University
>                       Vincennes, IN 47591
>             Voice (812) 888-5830 Fax (812) 882-2237
>                  Email: psmith@indian.vinu.edu
>                  Amateur Radio AA9ZZ, 7.030 Mhz CW
> 
> Invest in your Success. Visit the Vincennes University Web Page.
>                       Http://www.vinu.edu


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