I have been given a Galaxy 1000 linear amplifier by my brother and need it's manual or any information on how to operate it and use/availability of exciters. It has 4 Horizontal Sweep Tubes w/hat that are functional. I'd like to know the Plate Tuning and Antenna Loading procedures. There's also an "adjust-for-maximum" knob on rear of amp. Any specific/general information you can share will be appreciated.