2
APPENDIX B.................................................................................... 9
C
ENTS
T
ABLES FOR
N
ON
-
EQUAL
T
EMPERAMENTS
........................................9
C
ENTS
O
FFSET FOR
H
Z AT
A4 ............................................................. 10
APPENDIX C ................................................................................. 10
A
URAL AND
V
ISUAL
T
UNING
................................................................ 10
APPENDIX D ................................................................................. 11
W
HAT ARE
P
ARTIALS AND
B
EATS
? ........................................................ 11
APPENDIX E.................................................................................. 12
T
HE
T
WO
-O
CTAVE
"A"
T
EMPERAMENT
.................................................. 12
APPENDIX F.................................................................................. 15
C
ONTIGUOUS
-I
NTERVAL
T
UNING
T
ESTS FOR
E
LECTRONIC
P
IANO
T
UNERS
.......... 15
APPENDIX G ................................................................................. 16
O
CTAVE
T
UNING
.............................................................................. 16
SIGHT-O-TUNER II SPECIFICATIONS................................................ 17
INPUT/OUTPUT
JACKS ..................................................................18
SIGHT- O-TUNER
®
II
INSTRUCTION MANUAL
INTRODUCTION
The Musicalibrator (later renamed the Sight-O-Tuner (SOT)) was originally invented and designed by
Dr. Albert E Sanderson in the early seventies as a prototype to tune pianos. The invention led to the
application and granting of eight patents on circuit design and the method of measuring
inharmonicity to create a tuning that took inharmonicity into account. The patent rights were later
licensed to Tuners Supply to produce the Sight-O-Tuner. After a few years went by, there was an
attempt by Tuners Supply to change overnight the reimbursement terms of the contract that led to
a lawsuit. Those problems with the contract prompted Al Sanderson to redesign and start
producing the Sanderson Accu-Tuner® in his basement. By producing the product himself, Dr.
Sanderson had control over the quality and quantity of the units produced. Initially Inventronics was
repairing the Sight-O-Tuners to help out piano technicians in an attempt to keep quality of the SOT
up to Dr. Sanderson’s standards.
Jumping forward thirty years, recently the last person repairing the Sight-O-Tuners passed away,
and we received quite a few phone calls asking who would repair the Sight-O-Tuners. This got the
ball rolling to create a solution. Quite a few of the components in the SOT are no longer available
and repairing the original circuit design was not an option. So one of Inventronics employees, Brian
Day, started working on the idea of replacing the entire electronics and using some of the circuit
designs Inventronics uses in the production of the Accu-Tuners. This is the solution Inventronics has
come up with to keep the SOT owners in business until they are ready to step up to the Sanderson
Accu-Tuner.
Tuning with the new electronics in the Sight-O-Tuner II (SOT II) is very similar to the previous SOT
with two new features: