[Amps] 3-1000 or 4-1000?

[Dennis Watkins]

The 4-1000 has a metal skirt around the base of the tube with
holes in it.  The 3-1000 is glass over the entire base.

Roger Parsons wrote:

>Is it possible to tell the difference between a 3-1000
>and a 4-1000 just by looking? We have one where the
>lettering is completely disappeared. If it is relevant
>it has a metal 'base' - which means I can't see which
>pins are connected....
>
>Thanks
>73 Roger
>VE3ZI
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