Jim, Other than a faulty solder connection or an incorrect resistor value (R74, R75, R76, R77), I can think of only 2 things that might cause the PreAmp to not work - T6 could be connected incorrectly or the windings shorted together, or C146 may be faulty. Try tacking a 0.01 uF capacitor across R77 (bottom of the board) as a check for an open C146 and if that doesn't fix things, try rewinding T6.
73, Don W3FPR > -----Original Message----- > > I just finished K2 #4901 and it works great. The only thing I > have a question on is the preamp setting. When the annunciator > is on over the preamp, it seems as though background noise goes > down and the signal strength is reduced. In fact, there seems to > be little difference between the preamp and att settings. I've > been through the schematic and carefully reviewed the parts > installed for the preamp and I can't see anything wrong. Has > anyone experienced this problem, if it is one? > > 73 and thanks. > > Jim, K4ZMV > -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.322 / Virus Database: 266.11.16 - Release Date: 5/24/2005 _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
