> Apparently class C can also refer to the case where the transistor or
> tube is not fully on in the conducting portion of the cycle. In this
> case, the output amplitude depends on the input amplitude

it says here.......

"Class C is less well defined but is characterized by
conduction angles of less than 1800. There is usually
no bias voltage provided except by the drive signal, and
the efficiency is as much as 90%.

There are more classes. Saturated class C, sometimes
called C-E is a higher drive version of the same thing.
It can be 95% efficient.

Class D is a particular configuration using two transistors as switches.
Its use is limited by the parasitics of passive and active parts to
about 10MHz. It can be nearly 100% efficient.

Class E is a special zero voltage switching mode. It relies on
the proper phase relationship between drain voltage and
current to provide no overlap. The efficiency can be
100% with perfect parts. There are other classes,
somewhere between C and E........... "

see
www.advancedpower.com/TechnicalSupport/ApplicationNotesData/APT0001.pdf
and
http://iroi.seu.edu.cn/jssc9899/33ssc98/33ssc12/pdf/33ssc12-su.pdf

I've just leared there are Classes F1, F2, F3 and even Class S !!

............................... Zim

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