This 400 is a time capsule I restored a while back, only thing not installed was a bias adjustment. So I wanted to keep it simple with this unit and just install a trimmer that adjusts all output tubes at once. I have done this on other units like the 500-C and 800-C which was resistor R-132 with 10K trimmer, from what I see on the 400, it would be R-35 and a 2K trimmer needed. Looks to be a 1K resistor and located just to the right of the green can cap. Any help to confirm this would be much appreciated.