ELKA ELKAPIANO 88  
(2nd. version 1973)

> SCAN in PDF file of original Schematic 2nd version
(with S-2555 and S-2556 integrated circuits)

contents:
- Schematic Diagrams
- PCB Layouts for:
       PP-1 (Filters and Preamplifier)
       PP-2 (Contacts assembly)
       PP-3b (Octave generator)
       PP-4 (Power supply)
       PP-5 (Switches assembly)