Percussion tone monophonic electrical musical instrument

Claim 1

IN AN ELECTRICAL MUSICAL INSTRUMENT OF THE MELODY TYPE HAVING ELECTROACOUSTIC TRANSLATING MEANS AND AN OSCILLATOR INCLUDING AN ELECTRON DISCHARGE DEVICE THE GRID POTENTIAL OF WHICH DETERMINES ITS FREQUENCY OF OSCILLATION AND HAVING A MANUAL COMPRISING A PLURALITY OF PLAYING KEYS, A SOURCE OF RELATIVELY LOW POTENTIAL OF SUCH VALUE AS WILL CAUSE THE OSCILLATOR TO STOP OSCILLATING WHEN IMPRESSED UPON THE CONTROL GRID OF THE OSCILLATOR TUBE, A POINT OF RELATIVELY FIXED POTENTIAL OF SUCH VALUE THAT WHEN IMPRESSED ON THE CONTROL GRID OF THE OSCILLATOR TUBE IT WILL CAUSE THE LATTER TO OSCILLATE AT HIGH FREQUENCY, A PLURALITY OF RESISTORS CONNECTED IN SERIES BETWEEN SAID LOW POTENTIAL SOURCE AND THE GRID OF SAID OSCILLATOR TUBE, A BUS CONNECTED TO SAID POINT OF FIXED POTENTIAL, A PLURALITY OF SWITCHES ACTUATED BY SAID PLAYING KEYS EACH HAVING ONE POLE CONNECTED TO ONE OF THE CONNECTIONS BETWEEN SUCCESSIVE RESISTORS OF SAID SERIES OF RESISTORS, THE OTHER POLES OF SAID SWITCHES BEING CONSTITUTED BY THE SAID BUS BAR, TONE INTENSITY ENVELOPE CONTROL MEANS CONNECTED BETWEEN THE OSCILLATOR AND THE TRANSLATING MEANS INCLUDING A TERMINAL, THE POTENTIAL OF WHICH DETERMINES THE AMPLITUDE OF THE TONE SIGNAL TRANSMITTED TO THE ELECTROACOUSTICAL TRANSLATING MEANS, A STORAGE CAPACITOR CONNECTED BETWEEN SAID TERMINAL AND A SOURCE OF RELATIVELY FIXED POTENTIAL, AN AUXILIARY SPRING RETURN ENVELOPE DETERMINING MEANS