Hi Chuck, I did! Just unplug the RF-tube, plug-in two small pieces of ISOLATED copper wire but stripped of of its coating so as to connect , fit and be squeezed into the anode and 1st grid slots of the socket of the removed tune Twist the 2 isolated parts of the wires. Gives you a loose coupling of say 2.. 5 pF between both LC-circuits in front and behind former first RF-amplifier - still yielding very good preselection.
Works fine with me! Just getting a bit of less gain, t.b. compensated further down the signal path ( or audio), in any case behind narrow Xtal-filters. Result, as has been asked for? Even better IMD3 in CW if with 600 Hz Sherwood mods . Moreover: doing one of W8JI mods ( triode first mixer ) enhances performance even further of a stock version otherwise of poor performance ( as Sherwood benchmark shows). One other step still further is to replace that first mixer with a 7360 tube ( Re Squires & Sanders stunning ham-receivers I think you know). But that takes more of an effort I'm afraid to acknowledge. 73 Pierre F3WT Le 19 nov. 2012 à 18:00, drakelist-requ...@zerobeat.net a écrit : > Send Drakelist mailing list submissions to > drakelist@zerobeat.net > > To subscribe or unsubscribe via the World Wide Web, visit > http://mailman.zerobeat.net/mailman/listinfo/drakelist > or, via email, send a message with subject or body 'help' to > drakelist-requ...@zerobeat.net > > You can reach the person managing the list at > drakelist-ow...@zerobeat.net > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Drakelist digest..." > Today's Topics: > > 1. R-4C Antenna Input Direct To Mixer (Chuck Pool) > <[Drakelist] R-4C Antenna Input Direct To > Mixer.eml>_______________________________________________ > Drakelist mailing list > Drakelist@zerobeat.net > http://mailman.zerobeat.net/mailman/listinfo/drakelist _______________________________________________ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
