[Amps] Eimac 3-400Z date stamp

[Arthur Moe]

Jason,

Here is a trick that my Elmer told me 40+ years ago about reading info on tube 
glass.  Place the tube in the refrigerator and chill it. When cold remove and
breath on it until it fogs up. This sometimes makes missing writing readable.

Art
KB7WW

jsb at digistar.com wrote:
> 
> hi,
> 
> I have a couple 3-400Z tubes but I can't find the date stamp on the glass.
> The dome-shaped flashing along the bottom has  1T-833  engraved into it.
> Is there any way to derive when these tubes were made from that number?
> 
> Thanks,
> Jason N1SU
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