Many books about vacuum tubes and do-it-yourself have been published.
Here is a suggested title for the non-Japanese speaking audiophile:
Author: Hisashi Otsuka
Seibundo Shinkosha Publishing Co.,Ltd.
ISBN : 4-416-19610-5
price : 3600YEN
Full color 103 pages.
Many pages include big and beautiful pictures of tubes.
Chapter 1 "This chapter present full color pictures of vacuum tubes used in audio amplifiers and similar devices which are currently available in Japan"
Chapter 2 "This chapter introduces tubes of the past up to the 1980's, which were made by well-known tube makers and are now no longer readily available in the market."