I have located a U.S. Coast Guard Model R-100 VLF/MF ,AM/CW receiver covering 90 to 1500 khz,AM/CW ,rack-mount,which requires a extewrnal ac power supply for fil. and B+. It weighs 65 lbs and does not have a rear chassis case. Asking $75.00 + shipping help.Al,W1TUK c/o ispoulin at aol.com