[Amps] Help identifying tubes

[Alek Petkovic]

You should be able to tell with an ohm meter.

The filament pins are easy to identify. They are the same for the 
triode, tetrode and pentode.

If it is a triode, the 3 other pins will have 0 Ohms between them
If it is a tetrode, only two of the other tree pins will show 0 Ohms
If it is a pentode, there will be no continuity between any of the 
other three pins.

 From the pics, they look like 5-500 tubes but the Ohm meter should tell you.

73, Alek
VK6APK


At 12:09 PM 29/11/2010, mike stokes wrote:
>Hi Guys
>
>Someone gave me 2 tubes years ago and said they were 3-500s.  Well I am not
>sure they really knew, and I don't know as the lettering is worn off.  Here
>is a link with some pics.
>
>http://picasaweb.google.com/mike9v/Tubes#
>
>The one on the left is an Eimac.  It end in an A and has S4    7704 stamped
>inside.
>
>The one on the right is a Westinghouse and looks like it says 5/5xxA where
>the x in worn and illegible.
>
>Any ideas on what these really are ?  Or what is a good way to figure it out
>?
>
>Any help is appreciated.
>
>--
>Mike Stokes
>KK9V
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