Ohhhhh i just finish to mod my amp ( 1989 2204 Canadian model ) like you mentioned and... THANKS YOU !!! This mod kick ass !!! The glassy top end have dissapear and the amp sound much bigger !!!
I have the Canadian model 2204 and i m gonna check if the inside of my amp look like your and if yes , i m gonna mode mine too cauz i found it realy trebbley but i have a lot of bass so...