1. The old radio sound with Paper Cup Piezoelectric Speaker

    The old radio sound with Paper Cup Piezoelectric Speaker

    19
  2. Low voltage tube operation 02, 5AT8 Regenerative Radio

    Low voltage tube operation 02, 5AT8 Regenerative Radio

    13
  3. Vanishing in Tokyo hospital

    Vanishing in Tokyo hospital

    23
  5. Be careful Chinese HOAX products

    Be careful Chinese HOAX products

    10
  6. 6i1P(6AJ8)Single AM Transmitter testing in science lab

    6i1P(6AJ8)Single AM Transmitter testing in science lab

    16
  7. Sound Indicator presentation for Science Class

    Sound Indicator presentation for Science Class

    23
  8. The sound of TAISYO KOTO 'My Blue Heaven'

    The sound of TAISYO KOTO 'My Blue Heaven'

    10