Oh contraire, Rich. I seem to remember one of my old handbooks show an amp
using an 813 at 50 Mhz.
Mike(y)
W3SLK
----- Original Message -----
From: measures <2@vc.net>
To: michael watts <wy6k@yahoo.com>; Paul Christensen <paulc@mediaone.net>;
AMPS <amps@contesting.com>
Sent: Wednesday, September 06, 2000 10:16 PM
Subject: Re: [AMPS] Blown TL922A... What to do?
>
> >
> >It is an interesting question. Why do some amps have
> >suppressors and some don't?
> >
> 813s never need VHF suppressors. One can barely get them to work at
> 28MHz. 3-500Zs are rated for full output at 110MHz for Amplifier and
> Oscillator service. 8877s are rated for full suds at 300MHz. According
> to one computer analysis program, above 100MHz 8877s are capable of
> self-oscillation.
>
> cheers
>
> >--- measures <2@vc.net> wrote:
> >>
> >> >
> >> >> Tom- it does NOT take an EE to detect the bias.
> >> My professional specialty
> >> >> was Rocket motors, with only enough electronics
> >> exposure to 'appliance
> >> >> operate' good instruments, but my second
> >> specialty (used professionally,
> >> >> too) was the detection and analysis of verbal BS.
> >> You and I both know of
> >> >> another prime source, but he(they) change their
> >> tune, and use references
> >> >> newer than 1935. There is diversity there
> >> >
> >> >But then why does nearly every current-day HF
> >> amplifier manufacturer use
> >> >"1935 technology" with the inclusion of the classic
> >> coil turned around a
> >> >carbon composition resistor for the purpose of
> >> serving as a parasitic
> >> >suppressor?
> >> >
> >> >If parasitics are of little concern, who on this
> >> list (manufacturers
> >> >included) is perfectly comfortable with running (or
> >> manufacturing) their
> >> >multi-band HF amplifier without a parasitic
> >> suppressor? One manufacturer we
> >> >know of uses an 8877 without the use of any
> >> suppressor, but other amplifiers
> >> >in their product line do. Does this infer that
> >> some of their amp products
> >> >are prone to potentially damaging parasitics while
> >> others are not?
> >> >
> >> >-Paul, W9AC
> >> >
> >> good question, Paul. During the Grate Parasitics
> >> Debate, six times, the
> >> designer of the AL-1500 stonewalled my question
> >> about whether the 1500
> >> uses a VHF parasitic-suppressor.
> >>
> >> cheers
> >>
> >> - Rich..., 805.386.3734, www.vcnet.com/measures.
> >> end
> >>
> >>
> >> --
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> >>
> >
> >
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> >
> >--
> >FAQ on WWW: http://www.contesting.com/FAQ/amps
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> >
> >
>
>
> - Rich..., 805.386.3734, www.vcnet.com/measures.
> end
>
>
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