I have the book Beginners Guide to Tube Audio Design... I also have been looking at Booxhound Amp also to learn. This amp is real stripped down. Looking at this and understanding this amp helps as it is real basic. I then can look at the ST120 schematic and I get what most of everything does.
I am not really getting what is going on in the 12AT7 in the center spot. I don't get why only 1 is needed. I would think the amp needs 2 of these. each tube would handle a channel and have the signal run to the grid (assuming 2 tubes)... Then the Cathode and Plate do what they do. I don't get how the center 12at7 handles both R and L channels. Do both channels go to the grid? then the amplified signal is then split to R and L ?
Just trying to learn. This site rocks!