tional relays in the signal path to
degrade or compress sound.
When DC or HF is detected at
the input, the amplifier powers
down until the error condition is
corrected.
The output signal is constantly
compared to the input, so that, in
the presence of a difference
which exceeds predetermined
limits (typically a short circuit
condition), the amplifier mutes
until the error condition has been
corrected. Heatsink temperature
is constantly monitored by a
thermistor. In the event of over-
heating (temperature in excess
of 80° C), the amplifier will
power down and normal opera-
tion can resume when a safe
operating temperature is
reached.
Exterior
Non-magnetic materials are
employed throughout, the only
exception being the mechanical-
ly isolated transformer housing
The faceplate is machined from
a solid 40 mm black acrylic
block. A LED display provides
continuous information on Class
A status and AC condition.
With the exception of the face-
plate, the Mephisto exterior con-
sists entirely of brushed, black
anodized alluminium.
13
Watts pure Class A. This bias
level will be maintained even
when music is absent or when
the amplifier or preamp is muted.
If the user turns the volume con-
trol down below position 45, the
Preamplifier will automatically
instruct the amplifier to reduce
bias to 50 watts of pure Class A.
Bias L is selected manually from
the front panel. To leave L bias
you must select M or L bias on
the front panel.
If Green bias is activated,
GB
will be lit for 5 sec. in the dispaly
and the amplifier will automati-
cally adjus bias to match the
postion of the preamp volume
control.
While Green bias does not offer
the extreme low power con-
sumption of Class A/B, or even
the low power consumption of
"auto-biasing" systems, it does
offer significantly lower power
consumption without sacrifice or
compromise of even a fraction of
its PURE CLASS A performance.
The Mephisto user who do not
own a Gryphon preamplifier can
access the programmable bias
system manually.
Protection
The unique, non-invasive protec-
tion system offers reliable, fuss-
free protection without compro-
mising signal purity and signal
path simplicity, with no conven-
