[Amps] ALPHA 77

[PAUL HEWITT]

> >When I tune an 8877 amp, I
> tune everything for maximum power out.
> >I then tweak the PA loading
> cap slightly to give a
> needle-width decrease
> >on the wattmeter. I need to
> see the grid current at this
> time to make sure
> >it goes down and not up when
> making this adjustment. This
> slight reduction
> >in suds makes a nice
> increase in clean.
>
> True, Phil, but the 8877 is
> so clean that there are no
> transceivers even
> in the same league.

This "clean" isn't limited to the IMD
performance of the amp.  Harmonics/spurs
are also reduced by this slight antenna
overloading, usually by 5-15dbm.
Paul


PAUL HEWITT
WD7S PRODUCTIONS
QRO HOMEBREW COMPONENTS
http://wd7s.home.att.net