>If you tie the emitter of the first to
>the collector of the second, you are left with three external connections
>which can act like a single transistor with very high current gain.  The
>concept is similar to a darlington, which uses like transistors to emulate
>one high gain transistor.

Emitter? Collector?
Are they perchance anything like Anode & Cathode ? :-)

> Very poor for RF because of the Miller Effect.

And yet capable of improving performance of valve front ends substantially.
Long long ago I used an ARC-5 receiver (US WW2 war surplus still available
on amateur market decades after their birth) as a ham band receiver. I
changed the RF front end to Cascode configuration using a dual-triode with
all the (simple) circuitry being implemented in a space construction on a
valve base so the whole affair plugged into the original valve socket (not
my design). I now can't remember what the intended advantages were in this
context but the practical result was a vast improvement in the sensitivity
of the receiver. This was on the "80 metre" (3.5 - 3.9 MHz ham band) which
nowadays would almost not count as RF :-)


        Russell McMahon


            .

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