i solder the wires to the pins and still my tubes dont warm up. i checked and replaced all the fuses just to be sure. any other suggestions??

the power light does still come on. how should i check the fuses? my Bugera is only a year or so old. and where can i find the heater pins??

1. Stereo is 8ohm and Mono is 16ohm
2. im honestly not sure which. i had my neighbor do the connection since he was more knowledgeable on electronics so i will ask him.
3. i had my head set at 8ohms

Could wrong impedance be the cause for my tubes going out? ive checked the tubes and they look fine. my tone was not suffering the days before they went out. do i need to change the tubes??

I have a Bugera 333 and recently i have been able to turn on the amp but cannot get to the tubes to warm up at all. i have checked the fuse and it seems fine. i dont want to go out and buy new tubes until i know for sure that i need to. can anyone help me figure this out?

also i was having problems with my cab getting sound out of all 4 speakers. i solved this by connecting the wires from the mono/right side to the stereo/left side. could this be harmful to my amp??