With those tubes they are probably very close.
All this matching nonsense didnt come along until sweep tubes and then
import junk.
Cant forget the 8122 either, RCA's contribution to infamy.
Carl
KM1H
----- Original Message -----
From: <kb5gt@cableone.net>
To: <amps@contesting.com>
Sent: Thursday, November 18, 2010 10:54 PM
Subject: [Amps] Matched Pairs of Tubes
>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.
>
>
>
> ---- Msg sent via CableONE.net MyMail - http://www.cableone.net
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