Hallo mein deutchen fruends! 

Now to my question.. I bought a TT 12ax7 tube to put in the first/gain pre-amp position. Which of the pre-amp tubes is the first/gain tube?

Best regards

[Dobernig-Amplification]

Mostly, it is the nearest tube to the input.

Stefan

Looking at the Amp from behind, the tube at the far right.

You are quick 

Thanks guys!