>
>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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>> http://www.contesting.com/FAQ/amps
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>> Problems: owner-amps@contesting.com
>>
>
>
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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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