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Dual Gate Mosfet Transistor Substitution



I have a Microwave Modules MMA-144 144MHz preamp and wish to upgrade the
transistors.  The preamp employs two 40673 dual gate mosfet transistors and
I want to replace them with more modern low-noise devices.

Which is the best substitute?

The circuit diagram is available, if required.

Thanks
Deon ZS1ZL
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