NAF

New Audio Frontiers Italy opens with this realization a new product line: the Stradivari Line and the Stradivari Phono.
We have added some substantial changes to the new pre-line that has become the Stradivari Line Evolution.
The main changes have been made to the power circuit and in this case a new pair of separate transformers: one dedicated to
the anodic current and the other one for the filaments of the valves.
The current is completely rectified with valves with a 5Y3, while on the line signal all the capacitors have been replaced with the
most performing Mundorf.
It is a Line Preamplifier that has been designed to meet the demands of the mostexacting audiophiles; the study of original circuitry
and the choice of components of the highest quality make it a point of reference between devices of the category.
Meticolous care has been placed in the circuit of high voltage power supply that usesa very high gain error correcting stage based
on the use of a pair of 12AX7 whichdrives a 6CA7/EL34 as power tube.
The design of this circuit has been optimized to elimi- nate any parasitic oscillations and maintain a costant anode voltage and a
ripple less than 250 µV.
The excellent filtering and the use of circuit voltage regulators provide the DC voltages to the heaters of the left and right channels of
the preamplifier.
The heart of the apparatus is, however, the amplification stage itself, which uses (foreach channel) a first tube 5814 / 5963 / 12AU7 /
ECC82 as amplifier followed by a 5687 as output buffer.
The originality of the solutions adopted mean that you are before a device that combines the qualities of a sound smooth and enfolding,
with the quickness of a very wide dynamic that gives an exceptional sound detail.
The fidelity of reproduction is a further feature of the apparatus that helps to enhance the quality.
It was reached a percentage of distorsion at 1000 Hz of only 0.09% with a bandwidth which remains constant (less than 0.5 dB) from
20 to 50000 Hz and from 20 to 80000 Hz within 3 dB.All this maintaining a background noise absolutely not perceptible thanks to a
S/N ratio of 92 dB.
These characteristics are the result of a long study design and were detected in the measurement carried out on several specimens using
laboratory instrumentation HP and Tektronix.

Model: STRADIVARI LINE EVOLUTION

Type: Tubes

Gain: 15 dB

Frequency Response:
20 - 50K within 5 dB
20 - 80K within 3 dB

Signal to Noise Ratio: 92 dB