Crate Stealth GT-50H - Help Please

[Skyhooked]

Hello everyone,

I have a Crate Stealth GT-50H that I am hoping one of you can point me in the right direction with it.
I went to power on the head a week or so ago and I wasn't getting any sound. I then proceeded to test everything externally and everything came back clean.
Then I took the faceplate off and noticed the two right power tubes were brighter than the left two and they were also flickering creating a "ticking" noise.
I powered the amp off checked the power conditioner I was plugged into and then plugged the amp into a newer power conditioner.
At this point, the same thing happened but the far right tube blew and now I'm not getting any response from the amp at all.

What I know is I need to replace the Power Tubes. What I don't know is what caused this problem.
I'm suspecting it is the resistors because I've been told these are a known failure point because of the white substance in them drying out. These resistors are Colber 470 Ohm 5% CW5A and 10% CW5A. I'll be honest, I don't know what any of these means outside of the resistance.
After digging in, I noticed some of the caps are swollen as well and need to be replaced. Not a problem.
I've made up my mind I'm going to replace anything and everything I need to in order to get this amp up and running. I love it.

Does anyone have an insight as to what could have caused this issue?
Also, I have the schematic as well as the pictorial to reference. On the pictorial it calls out a sheet 2 to see the parts list. Does anyone have the parts list for me to reference when replacing these parts?
I have a friend that is helping me that is an electronics engineer but I'm struggling on sourcing the correct components.

Thank you in advance for any help or guidance.

[g1]

The tubes themselves are the most likely cause of the failure. Those 470 ohm 5Watt resistors will sometimes burn because of the failed tube, not the other way around. If they measure 470ohms, + or - 5%, leave them. Otherwise, replace the bad ones.

In case it was more than just a common tube failure, it's best to make sure you have the correct bias voltage at pin5 of the power tubes before you install the new ones. Your helper should be able to show you how. This can be done without power tubes installed.