[Milsurplus] RE TV-7 B/U tube ANOMALY ?

[Joe Foley]

Hi Pete,

Did you plug a headset into the pin sockets on either
side of the SHORTS TEST bulb?  Did you thump the tube
with your finger tip for each setting of the SHORTS
TEST while listening with the headset?

Joe

--- pete williams <jupete at bigpond.net.au> wrote:

> I came  across a  funny one ----  testing a  6ES8 -
> a  twin  triode
> for  RF used as a  cascode  amp. . with the 
> settings in the  book
> each  triode  section tested differently for  4
> tubes , 3  being
> allegedly new.
> Not only that but one  showed  shorts. . Some sent
> the  meter  hard
> over full scale +.Sufficient variation of  data  to 
> consign to the
> round  file.!
>  In the  radio  from  whence  it  came  ALL tubes 
> functioned
> perfectly.
> The  settings  are identical  to a   12AT7 with  fil
> and   bias
> different and  no problems with  testing 12 AT7
>  QUESTION. Is it possible that because of the high 
> gm of this  tube.
> the test proceedures do not make allowance  for the 
> internal
> construction which I understand ,means  very close
> proximity of  some
> of the  elements  -- grid to plate  for  example .
> It's hard to reconcile two tubes with the  same 
> basing but  differing
> types, one - 6ES8- goes ballistic on test even tho' 
> they  work fine
> in the radio  -   a Racal RA 117. !
>  Comments please !-- maybe other tubes act up.
>  Cheers
> Pete
> .
> 
> 
> Pete D . Williams
> METUNG 3904
> Australia
> jupete at bigpond.net.au
> 
>
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