How many positions does yours Icom 7300 tension knob adjuster have? My have 4, but I am not sure if there is even 5th position, because I can not move adjuster fully to the right side.
I cannot answer your question but I'm pretty sure somebody will come along and answer it. What I did want to do is to say... Welcome to Radio Reference!
I have a 7300 but it's packed for travel right now. I'll pull it out in about a week and if no one's responded, I'll check mine out. Great radio, I've had mine for about a year and a half. All on CW...