What you take for the letter 'N' is simply the greek letter 'µ', which stands for 'microfarads' so I don't see any mistake here.To be fair, the official SI abbreviation 'µ' is a dimensionless numeric prefix.

Have you looked at any of Merlin's books? Rumor has it that if we mention his name three times in this thread, he'll appear in the conversation and correct our misteaks. I've also heard other people complain about mistakes and a lack of proofreading, so maybe you're on to something. Maybe I'm just funny that way, but picture quality gives me a general bias about overall quality of the work, and crappy illustrations are a definite turn-off for me. I think that anyone who charges as much as he does for his books should put more effort into the graphics - especially in this day and age when software to draw schematics is so widely available that just about any post you'll find on the internet will have a better looking image than one of his books. That, and I think that the hand-scribbled illustrations that I've seen excerpted from the TUT series were substandard in quality in relation to the price that he's asking for the books. The biggest reason that I don't own any of his books is that I prefer to read vintage books from the golden era. Around here we spend a lot of time debating one transformer vs. Regarding his amp designs, I also disagreed with some of the transformer choices that he made in some of his amp recommendations, but I don't think that's at all significant. My memory is a bit foggy on that discussion, but I think that design has subsequently been revised to make it more safe to the user. I seem to recall a point in time where the Power Scaling implementation put high voltage DC on the front panel pots, which I thought was an irresponsible and dangerous design.

There've been plenty of times when I've had my idiot-hat on, so I can't blame anyone else when it happens to them. I don't think that's all that significant really, as it's not at all uncommon for people to have disagreements on things, and everyone makes mistakes. What I can say though, is that I've had several interactions with him on the forum where I thought his assertions were dead wrong from an engineering perspective. I don't have any of his books, so I can't answer your question directly.

The ultimate tone vol. 1.