Kankyu Okoku #57 2010 Stereo Sound Tube Kingdom Amplifier Fan Bo... book form JP
Yoshiro Uesugi ◎ EL34 Parallel Single Monaural Power Amplifier TAP38. Koreeda Shigeharu ◎ 7695 Single Stereo Power Amplifier KSM57. "Choose the latest speaker and tube amp specialized for music genre".