Melting finals

[John Adkins]

Certainly I've noticed this to be the case with my
SB-220.  However, I usually back off on power if they
get too bright.  One of the VHF oscillations that Rich
Measures has written about will melt the tube
instantaneously if it happens when the linear is at
full power.  If the oscillation occurs at lower power,
and if you're quick to chop the power, you can
(possibly) save a pair of 3-500$$.

John
w4kv

--- Sandy W5TVW <ebjr at I-55.COM> wrote:
> Subject: Melting finals
>
>
> > Last night, the finals on my SB-220 began to glow
> red.  I turned it off
> and
> > let it cool down.  Has anyone had that experience?
>  Tom W6EIJ
>
>     If you have 3-500Z's in it, and you are running
> full power with it,
> they are likely to glow "orange"!!  This is normal
> for these bottles
> and all the "old Eimac" glass bottle line.  (4-65,
> 4-125, 4-250, 4-400
> 4-1000, 3-400, 3-500, 3-1000 series)
>
> 73,
> Sandy W5TVW
>
>
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