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Page 4 PHONO Owner's Manual
Design Features
A classic architecture had been chosen to
provide a firm foundation for the RIAA
equalization and gain stages of the Phono1.
The RIAA uses a robust series EQ architecture
with high precision, low noise, high linearity
resistors and high precision polypropylene film
and foil construction capacitors for optimum
signal transfer. The Moving Magnet gain is in the
RIAA Equalization stage, using the latest ultra
low distortion, low noise monolithic preamplifier
device. This device combines extremely low
distortion with low offset, noise and high output
drive capability to be a transparent conduit for
the musical signal. The high performance gain
and equalization setting RC elements dominate
the musical signature of this MM/EQ stage,
leading to a detailed yet musical presentation.
The MM/EQ stage provides 40 dB of 1kHz gain.
The MC gain stage is connected optionally
before the MM/EQ stage and provides extremely
low noise and low distortion, again using high
performance resistors for gain setting and
adjustable input loading. The MC stage is
connected into the circuit using gas tight gold
jumpers, these jumpers also are used to set the
MC stage gain at 14 or 20 dB. This provides up
to 60 dB of 1 kHz gain for use with low output
MC cartridges.
No coupling capacitors are used in the signal
path, removing this source of signal
degradation. A servo is used around the MM/EQ
stage to insure low DC offset for direct coupling
to the control preamplifier.
There is over 10,000 uf of capacitance and LC
high frequency filters providing the raw DC.
The first stage of filtering drives eight (4)
individual regulators providing power
to the analog circuits, where audio grade
electrolytic and film bypass capacitors
complement the active regulation stages. A
highly isolated power transformer, oversized by
10X provides extremely low-noise and robust
raw power to feed the precision regulators.
The input impedance, gain and relative noise
levels can be optimized for virtually any
cartridge available. This is achieved through the
use of gas tight gold jumpers and precision
miniature switches to simplify the optimization
for virtually any cartridge.
The elegant simplicity of the signal path allows
the Phono1 to preserve the entire audio signal.
Warm Up
The Phono1's sonic performance will start to
stabilize after approximately forty (40) hours of
continuous power up.