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What is stereo?




There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.



H.H. Scott '59





Audio Note P2 SE power amplifier


The P2 SE is a pure Class A, single-ended amplifier. Its development is the result of Audio Notes ongoing research to find ways to make better audio products. A side from the six key features on which the design is based, atechnique called "Comparison by Contrast" is used to ensure that the product is developed with the most important specification of sound quality as the overriding factor.
The P2 SE design is derived from the Audi Note 's key technological features originally embraced by the On Gaku and kegon amplifiers.
These features include:
Pure Class A operation
Zero negative feedback
Single-ended output stage
Valve rectification
Directly heated, triode output stage.

Pure Single-ended operation.
The P2 SE is a single ended amplifier. This means that the complete music wave form reproduced by the amplifier is preserved as one "whole". Consequently, a true single-ended amplifier must be pure class A and operates in a coherent and natural way.
This produces significant sonic advantage compared to convetional push-pull amplifers since push-pull amplifers demand that a new "mirror" image wave form be created for the topology to work. Creating this perfect mirror image of the original wave form is rather a tall order and far from the only problem associated with push-pull amplifiers.

The stage uses one 6SL7 dual triode per channel. These tubes are connected in a SRPP method and this stage generates most of the required gain.
Since the amplifier is single-ended, no complex phase splitting circuitry is required and the signal from the 6SL7 tubes can be coupled to the output stage. Here, Audio Note aluminium foil, paper in oil capacitors are used instead of the inferior quality film types used so commonly in the audio industry.
The final output trasformers (one of the most critical components in a vacum tube amplifer) are of custom Audio Note design and provide previously unavailable performance characteristics. These transformers use massive cores to reduce saturation effects. This allows the P2 SE to produce impressively extended and controlled bass performance.

Specifications:
Maximum Output:  18 Watts RMS per channel into 4 or 8 Ω loads
Tube Compliment:  4 x 6L6 / 5881;  2 x 6SL7
Input Impedance:  100 k Ω
Power Consumption:  165 VA
Fuse Ratings:  2 A anti-surge (110 to 120 V supply);  1,2 A anti-surge (220 - 240 V supply)
Dimensions (W x H x D):  300 x 140 x 410 mm
Weight:  19 kg
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