| 摘要 |
PURPOSE:To obtain simply a tube sound by providing a means giving mechanical vibration to either a buffer or an amplifier vacuum tube of a vacuum tube circuit section amplifying a music signal to drive the means with the music signal. CONSTITUTION:The vibration of chord of an electrical guitar 1 played by a player is converted into an electric signal by a pickup 2, inputted to a preamplifier section 3 to form an effective tube sound. The output of the preamplifier 3 is changed into a tone matched to acoustic expression desired by the player at an effector section 4 and outputted from a speaker 7 via a level adjusting section 5 and a main amplifier section 6. The preamplifier section 3 consists of a preamplifier circuit 3A and a tone control circuit 3B, the output of the circuit 3A is applied to the circuit 3B and a level adjusting section 26 of a mechanical feedback system 30. The oscillator 18 is driven by the output of an oscillator drive circuit 21 and the mechanical output of the oscillator 18 gives a mechanical vibration to the buffer of the circuit 3A or the vacuum tube 11, allowing to make the playing effective. |
