[Amps] Used tubes

[David H Craig]

    Mike,

    I bought 2 supposedly NOS GS35b tubes- they were toast, grids audible 
bouncing around when shook.  I didn't have to do that to tell though- the 
USSR radar units used finger-stock to contact the filament & grid rings. 
Both these supposed "NOS" tubes have visable finger-stock marks on them.  If 
you like I'll send you photos... it is obvious regardless of how clean the 
anode cooler is.  My guess is that these were in for a long time so not sure 
if a short time in use would reveal the same, but there it is FWIW.

    73 Dave N3DB / 8R1DB

----- Original Message ----- 
From: "MIKE DURKIN" <patriot121 at msn.com>
To: "amps fourm" <amps at contesting.com>
Sent: Tuesday, January 12, 2010 6:51 PM
Subject: [Amps] Used tubes


>
> Is there a way to tell externally if a tube has been used ... Im guessing 
> not unless it was abused.
>
> I just bought a GS-35B.
>
> Mike
> KC7NOA
>
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