A.R.S. - W5AMI wrote: > I'm looking for some ideas on a negative feedback circuit for my > "Bartellsville KW" transmitter, as the one I installed does not seem > to reduce distortion from the 7581A drivers to my liking. > > See: http://amfone.net/ECSound/BartlesvilleTX/mod_circuit.htm >
Just as a point of curiosity, where are you metering the grid current/bias voltage? > As you can see from the schematic, I am returning feedback from the > plates of the 7581A's and not from the plate of one modulator. I > think I need to pick audio off one of the mod plates. Do a google search for "negative feedback" (with quotes) and wa1hlr. There's some great articles on the subject, including one about negative feedback on a T-368! (I think there were five 1Meg Ohm resistors going back to the cathode of a 12AX7(?) that in turn was driving a 6AQ5.) Interesting stuff. -- 73, etc -Geoff/W5OMR _______________________________________________ Amradio mailing list List Home: http://w5ami.net/mailman/listinfo/amradio_w5ami.net Partner Website: http://www.amfone.net Post: mailto:[email protected]
