※Shipping service. A new vacuum tube audio textbook that tightly packs the essence of “Vacuum Tube Audio Odan” (personality: Shin Ohashi), which is popular on Music Bird's audio channel, into one volume is now available. Please enjoy the wealth of wisdom for fully enjoying vacuum tube amplifiers. 2018.10.17 1st edition 1st edition published. The photograph is a sample, so the actual product may be broken, or there may be markings etc.