※Shipping service. Audio Amplifier Measurement Method Beginning with a Tester — Practical Vacuum Tube Amplifier Measurement/Table of Contents = Tester Edition/Oscilloscope Edition/Other Measuring Instruments Edition/Measurement Practice Edition/Repair Edition/Author: Teppei Kado/Published by Seibundo Shinkosha. The photograph is a sample, so the actual product may be broken, or there may be markings etc.