Considering this for a bass and guitar double duty head. For those with the knowledge, does anything look out of the ordinary? I have pics of a 67 I used to have and I see a couple differences between the two: I know the blue signal caps are what I want and the caps in the doghouse have been changed. On that last pic...what is the big long block by the transformer and big mustard colored cap? Where’s the bias pot? Obviously I’m not a tech...but I want to be one someday! Hoping for some experts to chime in.