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Old 1st December 2018
  #2
Here for the gear
 

I found some info that the test points on this amp are at PR1 & PR2 right by the bias pot. I get voltage at PR1 that reads -30V but PR2 has 0.00.

One tube lights up in both sockets but the 2nd tube does not & has some white particles. Also I get 0.00 reading on PR2 when the tube that lights up is in either socket. I know both tube lit before changing the trim pot. Is it possible to do any trouble shooting? I don't wanna waste $40 + on new tubes just to be disappointed.