I recently uploaded this.
Hammond oil spring reverb system
https://www.youtube.com/watch?v=MrL8Pi9UHi0
Pioneer SR-101
Moderator: jingle_jangle
Re: Pioneer SR-101
Discussion of piezo transducers here
JMI Vox Echo-Reverberation Unit -"Cliff Richard Reverb" (1962 - 1968) A Look "Under the Hood"
http://www.voxshowroom.com/uk/misc/reverb_hood.html
I found some patents that disclose the use of piezoelectric transducers with spring reverb/delay systems.
US 2375004 Training apparatus
US 3136853 Music enhancing systems
US 3189686 Transducer and mounting for mechanical delay lines
US 3246264 Transducer assembly for reverberative delay lines
https://patents.google.com/
JMI Vox Echo-Reverberation Unit -"Cliff Richard Reverb" (1962 - 1968) A Look "Under the Hood"
http://www.voxshowroom.com/uk/misc/reverb_hood.html
I found some patents that disclose the use of piezoelectric transducers with spring reverb/delay systems.
US 2375004 Training apparatus
US 3136853 Music enhancing systems
US 3189686 Transducer and mounting for mechanical delay lines
US 3246264 Transducer assembly for reverberative delay lines
https://patents.google.com/