I don´t see a resaon for it. And I make no use of it with my GG amps. I don´t use a passive input neither with GG amps, only with grid driven tetrodes. 73 Peter -----Original Message----- From: Amps [mailto:amps-bounces at contesting.com] On Behalf Of Jim Thomson ## You want some flywheel action with a tuned input..and a passive input wont provide that.