"Balancing" bias in two output tubes. (and another thing.)

[Gtrjunior]

I think a bias probe and volt meter or modern bias tool is worth the investment if you want to do this going forward.

They are not expensive.

I almost never use my Oscope anymore -just not needed.

100%.
You absolutely need a devise that will show you readings. You can’t just fiddle with the bias knob and hope for the best.

 

[Gtrjunior]

I realize that this isn’t your exact amp. This is the same Blackstar that I own. But this is how to bias it.
I own 4 tube amps and the bias procedure is exactly the same for all of them.

There is a mathematical formula that is used to calculate what your bias setting should be in YOUR SPECIFIC AMP.
There is no universal bias setting.

https://youtu.be/PtvsRn9H29Q