[Yaesu] N-Channel MOSFET Replacement

[rbethman]

Deon,

This same thing was fiddled with in Kenwood Transceivers.

They were initially built with 3SK45s.

We specifically replaced the 3SK45's with the 3N201s.

These four beasties, 40673s, NTE222s, 3SK45s, and 3N201s are all very 
close relatives.

We managed to get the 3N201s from someone working in the Bell Labs in 
Florida around 1980.

They are all also direct plugins for each other.  Sometimes the ONLY way 
to determine which one to use is simply try one of each in YOUR 
application.  The minor circuit differences between the radios can make 
all the difference.

I added the list back into the discussion.  THEY may find technical 
merit or useful information.

Bob - N0DGN
> There is a well-known N-Channel MOSFET replacement to increase the
> RX sensitivity of the mixer (Q103) in the FT-301.  I believe that it also
> increases the sensitivity of the first RF amplifier of the FT-101.
>
> Does anyone know which MOSFET is used for this replacement?
>
> Thanks
> Deon ZS1ZL