hi We must be ready to the new solar cycle and repair or setup our old 10 meter hr radio (one of the best ever made). here is a real good power modification for the hr-2510, hr-2600 and Lincoln. Or use this as a upgrade if your MRF477 or MRF497 fail. I have done many of this mod/upgrades with exellent results. Materials: 1 small washer 1 47uF to 100uF 25V capacitor 1 68 ohms resitor 1/2w 6 silver mica caps (values shows in pictures)(they are really needed) 1 SD1446 Pill (more cheap than mrf455) 1 small piece of wire 2 small screws (used to attach the pill to the radio cooler) heat sink compound (silicon not metal) Screwdriver, a drill and cutters After installing all the stuff and power on the radio adjust am power to no more than 15 W dead carrier. Download instructions here http://rapidshare.com/files/125848670/HR2510-_____PowerMod__.zip.html Any questions just let me know. Thanks and Enjoy!!!!