On 11/6/2012 0926, WQ9E at btsnetworks.net wrote: > Al, > > This modification for the R-4/A/B using the T-4XB filters was also printed in the 70s era ARRL "Hints and Kinks" book. If you need a copy let me know and I will dig it out. > > Rodger WQ9E > i would like to see this. -- *Charles Ring W3NU*