USE BS 170? Connect? Source to pin? 6? Drain to? 8? and put? a pull down of? ?100 ohms between gate? and? the? ?source . that's it? no current limiting required and there's? 100 % isolation between? the? activation volts and the? wetting voltage from the? ?Hipower excetp of course the share a common? zero volts line? . NO relay with this method? either.? BS170 will take? 60 V? Drain to? Gate which is far in excess of the? amp's supply voltage.?
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Beware.? The? Tokyo? ?irreplaceable? ?Hi power amps generally have NO over drive protection and can be burned out in this way? ?.? The? outputs generally have? SWR and overload protection.??
Timothy Fidler