Of course it works on the GS35b and also flawless on Henrys 8K ultra. With 3KV on the GS35 anode gain is slightly more then 11dB. 73 Peter -----Original Message----- From: Amps [mailto:amps-bounces at contesting.com] On Behalf Of Jim Thomson Pssive inputs wont work on a GS35B..which requires a lot of drive to begin with.