Appendix b - optimains protection – Abbingdon Music Research PH-77 Reference Class User Manual
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Appendix B - OptiMains Protection
OptiMains® Protection for Excessive Under/Over-Voltages
The PH-77 is fitted with the OptiMains® system to condition and adjust the incoming mains supply for best
operation under all normal mains conditions (including situations that will cause audible problems without Opti-
Mains®).
With the onboard mains conditioning, for the optimal sonic performance, after-market power conditions are not
recommended for use with PH-77. However, feel free to experiment to find the most sonically satisfying configu-
ration.
In the case of extreme power surges, brown outs or other exceptional/unexpected conditions that exceed safety
margins, the OptiMains® system will automatically switch off mains power to the internal parts of the PH-77 to
prevent any damage from occuring.
If the display reads:
A C
V
o
l
t
a
g
e
O
u
t
s
i
d
e
O
p
e
r
a
t
i
n
g
R
a
n
g
e
!
Power OFF your AMR component and wait at least 5 minutes. If and when the mains electricity has been deemed
to have returned to normal (such as during a brown out and the lights dimmed but have returned to normal bright-
ness) then power up your AMR component as per the manual’s instructions.
Please consult your
AMR distributor/dealer
for optimal power
configurations
Sometimes there are
excessive mains
fluctuations...
...OptiMains® will
detect and protect