I have an old pride 500 amp That uses 4x2879 transistors. It is showing a dead short when i turn it on, swr between radio and amp goes to infinity. If i turn it off everything is fine. It has on the back of it 12-80 meter i had been using it on hf and it worked good with 30-40 watts drive would do about 500 watts. My question is who can fix the short problem and check the input and output tuning? I don't know anyone around here that can tune an amp. Do you fellows Know anybody with a good reputation who may be able to help me out. Thanks in advance