The ones on the board are made by Zettler AC820-2C-12DE 5821. I appreciate you guys helping me. I have not even turned on the amp. I have been waiting to get all the parts for the mod to install. Before I use the amp. I just know that the output swr from the amp is going to be high going to the antenna. I sold my antenna tuner. Had I been thinking instead of spending most of my money on a restored amplifier. And having to buy a cheap radio. I should have got a Yaesu ft-1000mp. With the 200 watt amp and been done. Thank's again for all the help.