I hate it when that happens !
(grin)
----- Original Message -----
From: "CCW" <walkercc@earthlink.net>
To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Sent: Thursday, April 03, 2008 11:01 PM
Subject: Re: [TenTec] another amp question
> I once had an amplifier that exploded, blew up with a huge report and
> fireball , and blew me through a window in my shack.
>
> The fire department said that they had never seen such an explosion.
>
> Amplifiers can blow up, and when they do, hold on to your CB gear!
>
> K4NTY
> ----- Original Message -----
> From: "Gary Hoffman" <ghoffman@spacetech.com>
> To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
> Sent: Thursday, April 03, 2008 6:57 PM
> Subject: Re: [TenTec] another amp question
>
>
> > To me this whole parasitic issue is very nerve wracking.
> >
> > This issue seems to be that absolutely no one can say what triggers it
> > with
> > certainty, nor do people agree on the fix. Obviously ham radio
> > manufacturers build amps that they feel are appropriate and well
behaved.
> > They work for years. Then Blam !
> >
> > Some people claim it is not even real - they just say that component
> > failures happen, and trigger noisy failure modes.
> >
> > But there is a very credible body of evidence to the contrary also.
> >
> > There are many folks advocating relatively advanced modifications...and
> > another group who claim these are not worth the paper upon which they
are
> > written.
> >
> > I'm not convinced pro or con....but I have blown up two amplifiers, not
> > due
> > to operator error either.
> >
> > I guess I better just sign off on the subject yet again, since I'm not
> > really able to contribute much and no one has yet convinced me with
> > certainty that they have THE answer either.
> >
> > 73 de Gary, AA2IZ
> >
> >
> > ----- Original Message -----
> > From: "jerome schatten" <romers@shaw.ca>
> > To: <tentec@contesting.com>
> > Sent: Thursday, April 03, 2008 6:28 PM
> > Subject: [TenTec] another amp question
> >
> >
> >> Learned gentlemen...
> >>
> >> Excuse me if this is somewhat off-topic, but I've been following the
> >> 811 amp discussion with much interest and have a related question:
> >>
> >> I'm currently doing some work my pair of 813's and was thinking about
> >> the 'parasitic' problem as discussed on this list.
> >>
> >> My fear is not blowing the tubes or the band switch, but rather in
> >> blowing the front end of a modern transceiver driving it. The
> >> configuration is a pair of 813's truly running zero bias GG (grids all
> >> tied together and connected directly to ground ~ 50 ma. idle current
> >> at 2200v). No band switch (rotary inductor pi-network). Manual
> >> switching tx/rx avoids hot switching. Input to the amp is grounded in
> >> Rx. Works 80 thru 20 only.
> >>
> >> Should I be worried about the parasitic problem taking out what's
> >> driving it? If so, how to prevent (minimize) that? In the 40 years
> >> I've been running this beast (still the same set of tubes) I've driven
> >> it with everything from a Viking Ranger, to a Jupiter and never had so
> >> much as burp. But one never knows.
> >>
> >> Getting nervous in Vancouver,
> >> va7vv
> >> --
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> >> TenTec@contesting.com
> >> http://lists.contesting.com/mailman/listinfo/tentec
> >>
> >>
> >
> >
> > _______________________________________________
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> >
> >
> > --
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> > 10:48 AM
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>
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