[Amps] [Bulk] Help identifying tubes

[Bill Coleman]

On Nov 28, 2010, at 11:09 PM, 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
> ?

Looks more like a 4-400A. Go to Google and then click on images and search a bit.
3-500Z / 3-400Z don't have the metal base.

Bill Coleman, AA4LR, PP-ASEL        Mail: aa4lr at mac.com
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Bill Coleman, AA4LR, PP-ASEL        Mail: aa4lr at arrl.net
Web: http://boringhamradiopart.blogspot.com
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