[Amps] Matched Pairs of Tubes

[Jim Barber]

So does mine... I'm not quite that silly, tho. :-)

73,
Jim N7CXI

On 11/18/2010 7:54 PM, kb5gt at cableone.net wrote:
> I guess I just learned what makes a matched pair of tubes. A guy on fleabay has two
> 4-250A tubes advertised as a matched pair. The ad says that only the filaments have
> been checked. I sent him/her an email asking how they were determined to be a
> matched pair if only the filaments were checked. The reply was that they both had
> the same date code, and that is what makes them a matched pair. Amazing. His/her
> user name had the word audio in it.
>
>
>
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