As I bought my amp used, I am not sure if I am missing parts or not. But the input tuning coils seem to be loose and in need of lock nuts, did the original coils have a locking nut on them? Fortunately, the small nuts used in the amp fit the coils and I am using 5 of them as lock nuts on the coils with good results. So if you need lock nuts, the nuts on the hardware in the amp fit well. I was adding some solder tabs and I used 6-32 hardware to replace the original metric hardware and had the metric nuts left over for the coils.