Texas Star 667

[Thumper]

Hi, I'm new to the thread. I have a TS 667 I bowed up years ago as my unregulated power supply failed and shot 24volts to it, so I dug it out the closet ant dropped in new 1-2290 driving 4-2879 HG pills. I can only get 300 watts out of it now and found it has a bad variable now I believe due to Power supply isue , the only different is the pills, am I missing something? I was wondering if I could bypass the variable and use the variable on a radio?