This book is in good condition. The spine is undamaged, but there is some curling of the front cover and page corners.

Jack Darr's Electric Guitar Amplifier Handbook details the following: 

- How guitar amplifiers work

- How to make amp repairs properly and safely

- How to troubleshoot tube and transistor amps of all sizes

There are details on many amp circuits and much more! 

The final section of the Handbook is full of schematics for many of the guitar amplifiers in use at the time including models from Ampeg, Bogen, Baldwin, Fender, Gibson, Gretsch, and others. Line drawings and photos.