Have one 3 months old. I have had problems from the start. Never again i will purchase one...... purchased a dx 667 receive it it wouldn't work... opened it up found 2 solder joints that weren't soldered . contacted texas star told them about the problem said i couls solder the 2 places. they said go fot it. got it to work but something else was wrong bad SWR 3.0 couldn;t get it down. recontacted them said i would like to return it for whatever. also i would like to get a dx500v insted of 667. they shipped me a 500v it didn't work also solder joins not soldered. i resoldered what need to work. it worked. ran for 3 months. never ran with over 100 watts dead key.input fron radio 1 watt. the amp never put out over 250 swing. and never drew over 30 mamps of current . i tried 4 watts from my radio. didn't make a differance. last mont it smoked out at 1 watt input 80 watts dead key. it came with DEI'S for pills. two of them burn't out. knowing they were inferior. i purchased 6 HEI cost me a little over 200.00 dollars for backup's. i reinstalled all four dei's to hei's. the first time after my reinstall with a few resistors that were fried 5 resistors. i turned it on aned in 5 seconds it took out 2 of the new HEI'S. also burn't out the solder trace on the board . i replaced the HEI'S again. really start hurting my wallet. also checked the values os most capacitors ans resistors to see if they were within thier values. irepaced 2 100 ohm metal oxide resistors also 2 10 ohm on the base of transistors they got fried 2 100 ohm 2 watt resistors. also 1 1.8 ohm base resistor that was bad. also 2 polypropoline capacitors that looked discolored. finally got to work but the tune must bee really off on the board . it works bur can't get only 50 watts out put max. and it draws only 10 amps maximum from my 70 amp power supply. at least it isn't burning up 37.00 dollar pills anymore.i have a new combiner to install it was a little discolored from original burn out. all these problems are on the rear board. nothing on the front board. i did a power wire upgrade 6 guage and added 2 fans for cooling one top and ond bottom ran them from beginning. never was a temperatere issue. will try the new combiner.???? hate this amp. i own 2 RM Italys. 503 and 703 they are great amps. never a problem. years ago texas star were the go to. not anymore how could i get a 667 and 500v that dont work brand new bad solder joints. and no quality control???? i need some input to get this amp running with a proper tune. wich means changing VALUES of resistors. capacitors., or mh,s of inductance. i need some HElp. so i can sell it.