"John Smith" wrote in message
...
Yes, and most of that would be taken care of just by choosing an "rf fet"
as
compared to an "audio fet."
At least in the circuit I am looking at, the 6cw4 is operating at in input
impedance of ~500K-1 meg--the fet circuit will of course, expect 1 meg--no
sweat for a even a cheap rf fet...
As mentioned, the blocking cap removes all question of danger of HV bias
(I
will supply the bias--most likely though a resistor bias arangement
(perhaps
clamping it with a diode if there is any danger of damage), and the power
supply mentioned removes all danger of high B+ voltage...
This 6cw4 is the preamp in a frontend, signal levels are very low, there
is
a buffer stage following, with an amp behind that... certainly a signal
level compatible with a small signal fet...
The 6cw4 is a "hybrid" device... I am looking for a datasheet on it now, I
think replacement will go quickly and be simple, probably not even
requiring
revamping of the rf xfrmr on the drain (will revamp if noticible degrade
in
preformance....)

I was just hoping someone had walked this path before and could speed my
way
and hold my hand....

At this point, I am simply wondering, "Why hasn't someone done this
before!"

Is there a big call for these devices? Perhaps I can build them and
market
them on Ebay... grin

Warmest regards,
John
Hi John,
Guess I'm just a boatanchor fan and would leave the circuits alone-
especially if there is no improvement in functionality.

Dale W4OP