>If an amplifier runs without problems for a period of years it would seem
>logical to believe the original design is satisfactory, and also logical
>to believe that future problems are related to deterioration of components.
>
>This is a generalization for which there are exceptions. But, it should
>be safe to say that in most cases this statement would be more probably
>correct than not.
>
>Upon acceptance of this statement, it seems illogical to redesign numerous
>amplifiers based upon their failure decades after they were put in service.
>
>As an amateur scientist, I would rather work through and understand a
>specific problem than apply a generic parasitic suppressor kit that cures
>all problems.
>
>Because suppressors are designed to suppress something we cannot see or
>hear, they are given magical qualities. And, if they have special
>qualities that guarantee they will work under all conditions and for all
>amplifiers, they have even more magical qualities. Such a suppressor will
>be the magical shield that protects from all sorts of adversaries. It
>will improve the amplifier so that it is better than original.
>
>A number of years ago, I had a Heath SB-220 that exhibited fireworks. I
>installed nichrome parasitic suppressors and installed the other things
>recommended by Rich's original Ham Radio articles. It still had
>fireworks. His magic did not give me the magical shield I wanted.
On page 5 in the General Instructions, I talk about the importance of
using enough L-supp to cause R-supp to get hot on 10m. If R-supp changes
to a lighter blue with brown spots on 10m, you have a winner. Not enough
L-supp increases VHF Q, which increases VHF gain. It is possible to make
an amplifier oscillate by using not enough L-supp.
>
>I concluded that the magical shield did not work because I was not a
>believer. Simply stated, I was not worthy to have it work.
>
Was your tithing cheque cashed by the bagwan.?
>Once I realized I had no magical protection,
There is none. An amplifier that does not have hot suppressors on 10m is
at risk.
later, Colin
- Rich..., 805.386.3734, www.vcnet.com/measures.
end
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