HW-16 Final Tube Meltdown

[EP Swynar]

Hi Bob,

Sounds to me like the final is self-oscillating / "taking-off" on you for
some reason...

I can see something like that occurring on newly homebrewed / untested rigs,
but not on something that has obviously worked well, up till now.

Is there provision for the neutralization of  that 6GE5...? If so, is it
something simple, like maybe a wire coming up from below the chassis that is
then placed parallel to the tube envelope...which may have been
inadvertently dis-lodged / re-positioned this past week?

Perhaps a re-read of the manual in this specific regard could be in order at
this time, lest you fry that tube (and you WILL, too, believe me --- I've
done it with 811A's MANY times in the past)!

Keep us posted...

~73!~ Eddy VE3CUI - VE3XZ


*******************************************


----- Original Message ----- 
From: "Robert Wood" <radiorob at swbell.net>
To: <HEATH at LISTS.TEMPE.GOV>
Sent: Friday, September 05, 2008 6:51 PM
Subject: HW-16 Final Tube Meltdown


> All,
>
>
>
> I am encountering a very unusual problem with my HW-16.  All was working
well,
> and I operated it for about a week during the evenings.  Last night when I
> turned it on and monitoring 40 meters, the final turned red hot.  I moved
the
> switch to the current position, and noticed it was drawing current.  I
removed
> the 40 meter xtal and key and turned it one while switching bands and
> encountered the same issue.  I shut it off and retired for the evening.
>
>
>
> After getting home from work this afternoon, I decided to test the 6GE5 in
my
> Syncore tube tester.  I was hoping the tube may have a short, but the tube
> tested ok.  I put the it back into the rig with same results. Before I
tear into
> the rig, does anyone have any suggestions?
>
>
>
> I appreciate the help.
>
>
>
> Thanks,
>
>
>
> Bob
>
> K5MBA
>
>
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