Jim, You are correct about the grid cap on the 6K7. The person that changed the 6K7 to a 6AC7 was looking for higher front-end gain. To get it, he installed a shielded wire from the coil selector box through a hole in the small chassis plate next to the first RF socket, and from there to the G1 pin on the socket.
Ray ----- Original Message ----- From: "Jim Tonne" <to...@comcast.net> To: "Discussion of AM Radio in the Amateur Service" <amradio@mailman.qth.net>; <n...@securespeed.us> Sent: Tuesday, February 09, 2010 7:42 AM Subject: Re: [AMRadio] BC-348-R HFO Cover Needed > > > >> the 6AC7 (9000 umhos) instead. >> Either one far outshines the 6K7 with a >> transconductance of 1650 umhos. I >> think I have a 6K7 around, and it would >> be interesting to compare > > I think the 6K7 has a grid cap on top of > the tube but the other tubes mentioned > don't. > > - Jim W4ENE > > > ______________________________________________________________ > Our Main Website: http://www.amfone.net > AMRadio mailing list > Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ > List Rules (must read!): http://w5ami.net/amradiofaq.html > List Home: http://mailman.qth.net/mailman/listinfo/amradio > Post: AMRadio@mailman.qth.net > To unsubscribe, send an email to amradio-requ...@mailman.qth.net with > the word unsubscribe in the message body. > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > ______________________________________________________________ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
