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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