8874's have a 4 digit date code on the anode cooler.
Carl
KM1H
----- Original Message -----
From: "Eric Rosenberg" <ericrosenberg.dc@gmail.com>
To: <amps@contesting.com>
Sent: Friday, February 25, 2011 9:58 PM
Subject: [Amps] Determining the Age of A Tube?
> I'm using a borrowed ETO 78 (early vintage). The person loaning it to me
> (K2PS) has no idea how old the tunes are... he hasn't changed them. Last
> weekend (ARRL DX CW) we didn't get more than 1kw out, with lots less than
> that on 15 and 10m.
>
> We know the tunes are soft, but how soft are they an dhow do we find out?
>
> Thanks & 73,
>
> Eric W3DQ
> Washington, DC
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|