AUDIO HANDBOOK No.1 AMPLIFIERS (Adobe Acrobat Reader required to view.)
Authored by the well known Norman H. Crowhurst. This book is excellent for "newbies" as well as for those who have been away from tube audio to brush up on the fundamentals. It taught me the basic principles of loadlines, coupling, transformers and a whole lot more when I was a teenager..... Click below for PDF files WARNING! The file sizes are large, despite conversion to .pdf format which reduced the jpeg scan files by a factor of more than 2. This prompted me to break the book into sections.
Chapter 1 (1.6MB): On distortion, load lines for triodes and pentodes, bias conditions, reactive loads and push-pull.
Chapters 2, 3, 4, 5 (1.5MB): On instability, supply regulation, gain & resistor values (out-of-date!)
Chapters 6, 7, 8 (1.3MB): On, hum, screening, noise & intermodulation.
Chapters 9,10 (2.2MB): On input/output matching, damping, current & voltage feedback and impedance and output stage negative feedback.
Knowledge of the
underlying principles is needed to make best use of the information,
Edward Dell has kindly granted me
permission to publish these articles here. It will be a lot of work so if
you are interested, please be patient with me over the coming weeks and months.
Another terrific resource for a tremendous bandwidth of audio related information is the Audio Cyclopedia by Howard M. Tremaine, Pub. Howard W. Sams. The 2nd edition contains tube information.