- Dec 26, 2005
Hello Fisher 400 tube reciever owners,the two 12ax7 tubes directly behind the dial glass,that's the preamp section right? what's the function of each tube in this section. I think it's V8 V9? not sure I don't have a manual. just the 2 closest to the dail glass up front. I have 2-5751's I would like to put in those spots.