An electronic sensor device for detecting the vibration related to an amplification system within stringed musical instruments which include a saddle 2 mounted into a saddle slot 3 of a bridge 1 which is mounted onto the outside of the sound board 7; one end of a string of the musical instrument is stretched over the saddle 2; on the inside of the sound board 7, is a bridge reinforcing plate 10, such that bridge reinforcing plate is immediately under the bridge 1, separated by a sound board 7; a pickup assembly is detachably mounted on the inside of a sound board and partially extends upwardly to a bottom of the saddle 2, and the sensor device is characterized by: a fixed and mounted piezoelectric element 5 for each string, which is configured to convert string vibrations into electrical signals, each piezoelectric element is connected to a metal capped rod 6, wherein from top to bottom each integrally formed metal capped rod includes a rod portion 61 with a top 54, and a cap portion 62 with a top annular shoulder 52, and a bottom piezo receiving cavity 68, for each piezo-electric element 5 the piezo receiving cavity is adapted to receive in abutting fashion the top of the piezoelectric element, the top 54 of the rod portion 61 is well coupled in abutting relationship with the bottom of the saddle below the saddle slot 3, and the top annular shoulder 52 of the cap portion 62 is located in well coupled abutting relationship with the bridge reinforcing plate 10, such that induced vibration from a string is transmitted through a sound board onto the bridge reinforcing plate 10 and onto the top annular shoulder 52 of the metal capped rod 6, and vibration from a string is also transmitted through the saddle 2 to the top of the metal capped rod 6 wherein the metal capped rod transmits and carries vibrations from the saddle 2 and also from the sound board via the bridge reinforcing plate 10 to the piezo electric element 5. a fixed and mounted piezoelectric element 5 for each string, which is configured to convert string vibrations into electrical signals, each piezoelectric element is connected to a metal capped rod 6, wherein from top to bottom each integrally formed metal capped rod includes a rod portion 61 with a top 54, and a cap portion 62 with a top annular shoulder 52, and a bottom piezo receiving cavity 68, for each piezo-electric element 5 the piezo receiving cavity is adapted to receive in abutting fashion the top of the piezoelectric element, the top 54 of the rod portion 61 is well coupled in abutting relationship with the bottom of the saddle below the saddle slot 3, and the top annular shoulder 52 of the cap portion 62 is located in well coupled abutting relationship with the bridge reinforcing plate 10, such that induced vibration from a string is transmitted through a sound board onto the bridge reinforcing plate 10 and onto the top annular shoulder 52 of the metal capped rod 6, and vibration from a string is also transmitted through the saddle 2 to the top of the metal capped rod 6 wherein the metal capped rod transmits and carries vibrations from the saddle 2 and also from the sound board via the bridge reinforcing plate 10 to the piezo electric element 5.