Thanks, Andy I understand your IP and trade-secret issues. That's an interesting approach. I'll have to give it some thought, although I don't expect to be building preamps anytime in the foreseeable future. Was just curious why so many J-310/309. Now I understand.
Have a good afternoon! 73, Charlie, K4OTV -----Original Message----- From: Topband [mailto:[email protected]] On Behalf Of Andy Ikin Sent: Monday, August 26, 2013 6:29 AM To: Charlie Cunningham Cc: Topband Reflector Subject: Re: Topband: Anyone have a boat load of J-310s? Charlie wrote on Aug. 26. "Your preamp sounds very interesting! It must be fairly elaborate, if it uses 8 of the J309 FETS! I'd be interested in the circuit!" Charlie, I don't disclose circuit diagrams for commercial reasons. However the design is a push-pull using 4 fets in parallel to increase the gm and reduce the channel resistance, hence lower the noise. 73 Andrew G8LUG _________________ Topband Reflector _________________ Topband Reflector
