Re: VTTC question

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Liviu Vasiliu <teslina@xxxxxxxxx>


Probably the tube is defective, the difference is too
big.


vasil
>
>
--- Tesla list <tesla@xxxxxxxxxx> wrote:

> Original poster: robert heidlebaugh
> <rheidlebaugh@xxxxxxxxxxxxxx>
>
> Matt: Everry time I change tubes in  my VTTC I must
> re tune the feedback
> and the the bias level
>          Robert   H
> --
>
>
>  > From: "Tesla list" <tesla@xxxxxxxxxx>
>  > Date: Thu, 14 Jul 2005 11:20:11 -0600
>  > To: tesla@xxxxxxxxxx
>  > Subject: Re: VTTC question
>  > Resent-From: tesla@xxxxxxxxxx
>  > Resent-Date: Thu, 14 Jul 2005 11:26:45 -0600
> (MDT)
>  >
>  > Original poster: FutureT@xxxxxxx
>  >
>  > In a message dated 7/13/05 8:20:33 PM Eastern
> Daylight Time,
>  > tesla@xxxxxxxxxx writes:
>  >
>  >
>  >> Hi all,
>  >>
>  >> I have a VTTC in which I am using a GU-81M
> pentode. I figured since I only
>  >> have one I should get a backup tube just in
> case. So I found another GU-81M
>  >> on ebay and it was supposidly new, so I bought
> it. Tonight when I went to
>  >> try it out on the coil there is no breakout and
> a very little spark when I
>  >> touch a screwdriver to it. My question is: could
> the tube have slightly
>  >> different ratings so that tuning the coil would
> correct the
> problem or is my
>  >> new tube actually used and at the end of its
> life?
>  >>
>  >
>  >
>  > Matt,
>  >
>  > my guess is the new tube is defective in some
> way.  either
>  > worn out or just defective.  generally the
> ratings should be
>  > very close in the tubes I work with.  I would
> doubt the tube
>  > you mention wuold have such sloppy specs, but who
> knows?
>  >
>  > John
>  >
>  >
>
>
>