Topband: Anyone have a boat load of J-310s?

[Charlie Cunningham]

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:topband-bounces at contesting.com] 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



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Topband Reflector