Yes, Carl --
I agree. The #1 rule in tuning up is LOAD IT LOAD IT LOAD IT.
Otherwise you can expect the light show. Better to keep it a little bit
loaded with a hair of reduced power out, until you can get the edges
smoothed out rather than unload it to the point of possible continued
arcing between the plates. 'Cause once you've got a little sharp point
on one of those plates, your problem is just gonna get worse. I have
been there before with an L-4B.
73, Gents --
Mitch KG9DB
> -----Original Message-----
> From: km1h@juno.com [SMTP:km1h@juno.com]
> Sent: Thursday, April 16, 1998 5:04 PM
> To: amps@contesting.com
> Subject: Re: [AMPS] ARCING MORE
>
>
> On Thu, 16 Apr 98 10:49:45 -0500 Jon Ogden <jono@webspun.com> writes:
>
> >Excuse me if I am dense,
>
>
> Possibly OR you didnt bother reading the original post Jon.
>
>
> but how can operator error produce an arc?
>
>
> Wrong antenna is a classic way to a path of destruction.
>
>
> >If
> >the amp is completely stable and bullet proof to begin with and no
> >components are damaged, how did the arc begin? Sure operator error
> >could
> >have damaged another component and that failure caused the arc. That
> >component would need to be replaced as well as the cap.
>
>
> I fail to follow your reasoning...it is certainly not logical. In
> this
> case the capacitor was the weakest link and failed first. Otherwise it
> could have been the bandswitch or even a tube if it was one of those
> fussy ceramic ones.
>
>
> >I'd definitely follow AG6K's advice and check the parasitic supressor
>
> >resistor resistance.
>
> Pure horse s..t The capacitor arcing has limited the RF current and I
> also HIGHLY DOUBT if any other component is damaged. Since the amp is
> still putting out some RF that pretty much covers that issue...a
> shorted
> tube would be quite evident. The only other possibility is pecker
> tracks
> on the bandswitch.
>
> Jon, I realize you are an EE but have you ever seriously used or
> built a
> high power HF tube amp before? Or is the 4-1000A project the first?
> The
> reason I ask is that anyone with some real world experience has done
> at
> least a few stupid things to his amp and has suffered the consequences
> and is probably saying "yep, been there done that".
> I fail to see why this thread is progressing up to La-Laa land and
> parasitics again.
>
> I suggest letting the Centurion owner file or replace the plates and
> then
> let US know what results...not going off into some endless loop
> perpetuated by magic or lack of information.
>
>
> 73 Carl KM1H
>
>
>
>
> >
>
>
> >
> >---------------------------------------------------------------------
> -----
> >Jon Ogden
> >
> >jono@webspun.com
> >www.qsl.net/ke9na
> >
> >"A life lived in fear is a life half lived."
> >
> >
> >
> >
> >--
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> >Problems: owner-amps@contesting.com
> >Search: http://www.contesting.com/km9p/search.htm
> >
>
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