This is the inside of the preamp. On the left in the middle of the chassis is the reverb transformer. The large board in the middle is the brilliant channel board. The smaller board to the right is the mixer/driver board. The next two boards mounted vertically are the reverb board on the bottom and the normal channel board on the top. The long board on the right side is the tremolo board. It is interesting to note that on the control panel it is labeled "Tremeoo" while on the schematic it says "vibrato".