2 wrote:
> Over-current fuses open to limit current, but over-current transistors
> often short, which does not limit current. The 8877 grid is capable of
> dissipating 25w in AØ mode. Since typical grid-cathode potential is c.
> 57Vrms, 25w works out to c. 440 grid mA. I have never seen a kaput 8877
> grid that had uniform gold evaporation - such as would be the case with
> too much DC grid current. Mr, Murphy said that everything is more
> complex than it first looks.
How much of this gold sputtering could be caused by long-term long-duration
mild-to-moderate overdrive of the grid?
I ask this, because I know plenty of moron hams with amps that obviously do not
understand the principles of the amplifier, and
routinely overdrive them. The number of Extra-Class hams who do so is
astounding [thanks a lot, Gorden West]!
On a side note, as a no-code tech, I was having to explain basic antenna
principles to extras who most obviously didn't know WTF
they were talking about.
Basically, what I am asking is what is the factor of abuse in these
gold-sputtering cases caused by what I call "ABCD Hams"?
jim
--
ET has one helluva sense of humor!
He's always anal-probing right-wing schizos!
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