Do you have the schematic? That will help you decipher which is which.
The pcb will likely have the reference numbers printed on the pcb.
Maybe post a pic as that will help us.

I'm guessing you have about 8 secondary wires, 2 for HT, 3 for Filaments and another 3 for the opamps.
HT will be ~ 300 ish VAC, Filaments will be around 3v5-0-3v5 AC and the opamps will be ~ around 12-0-12 VAC.
not sure about the bias,, might be tapped off the HT?
Others here will know more.
You will need to build your self a limiter before you turn it on other wise you might just blow up more parts.
See here for details on how to make one;
https://www.ssguitar.com/index.php?board=2.03rd post down.
Phil.