These are the real deal. I guess it was what I had hoped for. Real circuits from Mullard. Great for your library on tube amp design.

Great light reading

Good

Great book, with lots of useful information design and circuits.

If you’re interested in good sound reproduction and DIY projects, know a little about electricity without being an expert on electronics, this is for you. It contains simple, clear descriptions of the theory of valve amplification and the design of circuits, together with practical step-by-step instructions for building a number of excellent amplifiers. These range from a 3W single-ended amp to a 20W push-pull power amp, including the outstanding Mullard 5-10 design. Many of today's high-end audio amplifiers are based on these circuits. For those who love vinyl there is a section on how discs are recorded and played back, with clear explanations of the sources of distortion. In the 1960s I was one of a small group of medical students who loved music but could not afford good hi-fi equipment. One of us stumbled upon the original edition of this book. There was a shop in Cape Town where you could buy all the parts; you could make up a kit in a cardboard box very cheaply. I built a 7-Watt stereo amp just by following the instructions in the book. I'm now planning to build myself a stereo system for my study based on the Mullard 3-3 amp.