TEN TEC OMNI-V Final AMP MRF458 burned out several days ago, so I replaced them with 2SC2879, readjusted bias, it worked OK, except at 10 mtr band it put out 75 watts stead of 100 watts. for info just in case somebody have same problem. MRF 458 is difficult to obtain. I did not made any change in circuit, except readjusted Bias to Factory Spec. of TEN TEC for MRF458 which is 500 mA collector current for Both Transistor.