Classic No. 16.6 HighEnd HiFi Stereo Tube Amplifier

Absolute Top Class Unit, 2x 55/25 W in ultra-linear / triode mode, extremely wide Frequency Response, ideal for SACD 2-Channel as well as Phono Playback.

A non-compromising absolute top-class tube amplifier with precise, perfect playback in highest resolution, transparency and dynamic, elegant and polished appearance. 

With Anode Current Testing System for Final Stage  and DisplaySystem for Tube Usage Time  .

also available in US voltage 110V / 60 Hz

Description

No.16.6 is an Integrated Tube Hi-Fi Amplifier, newly developed by Beijing Yushang Audio Technology Co., Ltd. with 6550A or KT88 tubes as PP amplification of final stage.

To get lower distortion and better amplitude-frequency and phase-frequency characteristic, its input stage adopts SRPP circuit consisted of 12AT7. The inverter stage works in constant-current source mode of long-tailed inverter circuit consisted of integrated circuit and 12BH7, which has a more excellent characteristic of AC balance than a typical long-tailed inverter circuit has, also can reduce phase distortion. This inverter stage also has an enough up-dynamic margin that can improve overall system’s distortionless output power. Final stage is a power amplifier stage consisted of 6550A or KT88 tubes, which can be converted between ultra linearity and triode amplifying mode. Grid employs the mode of fixed bias.

It is worth specially speaking of its output transformer that we, Yushang Company, newly developed. With output power 65W (30Hz) and primary impedance 4.5KO it perfectly matches with 6550A. Both its synthetic technology parameter and sound quality have proved that it can bear comparison with some nowadays well-known output transformers in the world. Its primary inductance runs up to 210H(4.5KO 50Hz) and it only has a 3.95mH of primary leakage inductance. Primary impedance is exactly flat between 1K—10KHz frequency range and at other frequency range the impedances variation is slight as well. This transformer’s power frequency response is 5Hz-150KHz(-3dB), primary resonance frequency 240KHz and distributed capacitance below 100Pf. To ensure the transformer has both high function and quality, Yushang spares no expense to use the best silicon steel material that is imported from Japanese Nippon Steel, and after being stamped out and tempered by Yushang, its permeability can be 1.9T. So it is impossible for the silicon steel in general use, Z10 Z11, to be a rival to it. All of these make the transformer have many acoustic advantages, such as deep and clarity bass, full and stout mid-rang, and rigorous and spread high frequency

Because No.16.6 was designed rigorously, reasonable settings like terrestrial current distribution, sampling points of loop negative feedback and local negative feedback make the overall system’s open-loop characteristics have a strong performance. Also because the crossfire signal that goes into signal line is well controlled it can eventually perform give out a clear and precise sound quality.

Although its total loop’s negative feedback is 6dB, due to reasonable design the parameters of overall system still keep a quilt high level.

On appearance its design is unique with becoming height. Considering that tubes’ plate current will change within their lifetime, a digital Ia meter is equipped to help users monitor the working mode of the final stage’s tubes. Practice proves that this function is essential for audiophile to have.

The toroidal power transformer uses Nippon silicon steel Z11. No. 16.6 has a high-voltage time-delay circuit for the moment when it is turned on, choking winding, electron filter and remote controller that is shaped from aluminum.

It comes with IR remote control in solid aluminum enclosure.

Technical Data

Output Power:
Frequency Response:
Harmonic Distortion (THD +N):
S/N (without weight):

Input Sensitivity:

Output Impedance:
Tubes:

Remote Control:
Power Voltage:

Power Consumption:
Dimensions:
Net Weight:

 55W RMS in ultra linear mode, 25W RMS in triode mode

5Hz to 88KHz -3dB (8W), 12.5Hz to 80KHz -3dB (55W)

0.21%(1KHz 8W), 0.47%(1KHz 22W), 0.92%(1KHz 55W)

95dB

0.3V RMS

4Ω. 8Ω

4x 6550A / KT88, 2x 4/12BH7EH, 2x 12AT7

IR

AC 110V±10%, 50-60 Hz or 220V±10%, 50-60 Hz

130W (220V)

420 × 337 ×116 mm (W x D x H)

20 kg

Delivery Volume

1 amplifier, 1 power cable, 1 remote control, 1 original operating manual.

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