need help modding peavey ultra plus

[tcollins1123]

hey guys im wanting to add a choke and maybe do a few other simple mods to my ultra plus to help the over all tone.. my 1st question is what size choke do i need?? its a 120watt head.. and my other questions is i am wanting to tighten the amp up a little and give the crunch channel more usable gain.. is there any simple resistor swaps i can do for what im asking in the mod range and on the choke where actually do i replace the resistor anyone will to help me i can send them a schematic let me know.. i added the schematic if it doesnt pull up what you need please send me your email and ill send it over to ya..

thanks