ho-10 problems

[kevin smith]

i have a heathkit ho-10 that was working fine until last night,smoke
started to come out of it,i opened it up,and found under the 1v2 tube a
resistor burned out 220k ohms, i replaced it and it smoked up,plus i
replaced the 500 k pot linear control on the hor.switch it was arking
inside of it, its still doing it, all the tubes light up , do not know
alot about what to look for any help on this one?----kevin