The 2nd IF/audio board for my TR7 has problems in the BFO amp, but I can't get further without extender cards so...... I'd like a get a used 2ndIF/audio board (I'll swap the old board back to you if you like to fix them) OR a cheap TR7 (doesn't need to be pretty, have xtra filters or noise blanker) OR a reasonably priced set of extender boards. Thanks for any help. Scott