WELTRONICS

AMC

The awakening of a Sleeping Beauty
 
Peter Bath, formerly at NAD, Acoustic Research, Proton and others, harnessed the cost efficiencies that are available from AMC's “common-platform” product design and ODM JIT SoD production efficiency to bring to market a product range that pretty much ticks all the boxes on an Audiophile’s wish list … at very attractive prices. 

DIGITAL SOURCE SERIES

Although AMC Digital Line consists of a large number of digital components, we have selected only 3 components of particular interest for use in audiophile systems ... The 24192i-vt vacuum tube output DAC/PRE, the XCDi vacuum tube output CD Player / DAC, and the 24192i solid state Class A output DAC/PRE.

AMC 24192i - vt   Vacuum Tube Output DAC/PRE  -  $ 1,599

What is very attractive about the 241192i-vt is its functional versatility ! A full function Preamp with 8 digital inputs - AES / EBU (1x), S/PDIF coaxial (2x), Optical (4x) and USB up to 24/192 - as well as a S/PDIF coax digital output, an unbalanced analog output and a XLR balanced output XLR. Ethernet input can be ordered as an option. Remote ? ... yes, and they included their step-less, relay-less VRI source selector circuit .

 

The Burr Brown PCM 1798 DAC -- a bit of a "yoda" in chip-land -- was retained for its superior bass response and its overall musicality and "augmented" with a "rollable" ECC83 Class A-configured tube output stage. We felt that all of this pretty much met all our requirements for a component retailing at $1,599 !

AMC XCDi - vt  Vacuum Tube Output CD Player / DAC - $ 1,429

The AMC XCDi was designed to play :

  1. Standard non-compressed PCM CDs

  2. MP3 compressed Compact Discs [selectable via the MP3 source setting]

  3. Digital Music Files directly from your computer or a SD Card [Slot provided]

It Features :

  • A premium transport and servo drive system assures constant data retrieval and unsurpassed tracking performance

  • Chip : The Burr Brown PCM1798 is designed around a 24-Bit/ 192 KHz Sampling Advanced Segment D/A Converter architecture to achieve excellent dynamic performance (123dB typically) and improved tolerance to clock jitter.

  • The DAC offers excellent SNR up to 123dB [typical], excellent THD+N down to 0.0005% [typical]

  • An excellent 8x Over-sampling Digital Filter giving Pass-Band Ripple down to + - 0.002dB. The DAC can handle a sampling frequency of 10kHz to 200kHz and accepts 16, 20 and 24-Bit Audio Data ... with Digital De-Emphasis.

  • A unique 5-pole linear active LPF (Low Pass Filter) prevents interference from ultrasonic noise commonly found in other CD playback systems.

  • The advanced switching mode power supply design incorporates separate windings for the digital, analog and servo circuits to prevent interference and preserve sonic performance.

  • EIA calibrated audio outputs ensure proper match with pre-amplifiers and receivers. 

  • The XCDi-vt incorporates independent high voltage power supplies for the valve circuits.

  • The tubes function in a so-called "class A" amplification.

AMC 24192i   Solid State Class A Output DAC/PRE  -  $ 1,099

The AMC 24192i DAC/PRE shares the same technical platform and functionality with the 24192i-vt ... but replaces the tube output stage with a solid state Class A discrete output circuit. If paired with an integrated tube amp, we felt that the solid state output stage may prove to be a more balanced match ... and at $500 less, it deserved consideration.

24192i

PRE/DAC

Specifications

 

Analog Output Level

2Vrms - @ 1kHz / 0dB

Digital Output Level

0.5Vpp - S/PDIF

Digital Load Impedance

75 ohm - S/PDIF

Peak Emission Wavelength 

660nm - S/PDIF

0.0025% - 1kHz / 0dB - "A" WTD

Input Sensitivity

100mV  / 1V RMS

Input impedance

22 Kohm ohm / 150pF 

Frequency Response

@ 1kHz/0db  -   +/-0.2dB

S/N Ratio

"A" WTD  - 114dB 

Dimensions (WxHxD)

430 x 82 x 307 mm

Net Weight

5.2 Kgs

Shipping Weight

6 Kgs

24192i - vt

Tube Output PRE/DAC

Specifications

 

Analog Output Level

2Vrms - @ 1kHz / 0dB

Digital Output Level

0.5Vpp - S/PDIF

Digital Load Impedance

75 ohm - S/PDIF

Peak Emission Wavelength 

660nm - S/PDIF

THD

0.0025% - 1kHz / 0dB - "A" WTD

Input Sensitivity

100mV  / 1V RMS

Input impedance

22 Kohm ohm / 150pF 

Frequency Response

@ 1kHz/0db  -   +/-0.2dB

S/N Ratio

"A" WTD  - 114dB 

Dimensions (WxHxD)

430 x 82 x 307 mm

Net Weight

5.2 Kgs

Shipping Weight

6 Kgs

XCDi - vt

Tube Output CD Player/DAC

Specifications

 

Analog Output Level

2.2Vrms - @ 1kHz / 0dB

Output Impedance

120 ohm

Digital Output Level

0.5Vpp - S/PDIF

Digital Load Impedance

75 ohm - S/PDIF

Peak Emission Wavelength 

660nm - S/PDIF

THD

0.0011% - 1kHz / 0dB - "A" WTD

Frequency Response

5Hz - 20kHz  -  < +/-0.2dB

S/N Ratio

"A" WTD  - 115dB 

Dimensions (WxHxD)

430 x 82 x 300 mm

Net Weight

4 Kgs

Shipping Weight

4.5 Kgs

Features

 

DAC Chip

Burr Brown 24bit / 192kHz 

Digital Filter

UPSCALER - 8 x Upsampling

Digital Outputs

75 ohm - S/PDIF

Digital Inputs / Outputs

IN : 1 x USB / 1 x AES/EBU

IN : 1 x SD Card / 4 x Optical

IN : ETHERNET - Option

OUT :  1 x S/PDIF Coax

Analog Outputs

1 x RCA / 1 x XLR - Balanced

Output Stage

Solid State - Class A / Discrete

Volume & Source Controls

Volume : VRC / Rotary motorized

Source : VRI / Step-less/Relay-less  

Preamp Tone Controls

Treble / Bass / Balance

Direct Output Mode

Tone Control By-pass

Output Stage

Tube - Class A - ECC83 x 2

Headphone Output

Yes / 1/4" 

Remote

Yes

$1,099

Special Offer - $999

Features

 

DAC Chip

Burr Brown 24bit / 192kHz 

Digital Filter

UPSCALER - 8 x Upsampling

Digital Outputs

75 ohm - S/PDIF

Digital Inputs / Outputs

IN : 1 x USB / 1 x AES/EBU

IN : 1 x SD Card / 4 x Optical

IN : ETHERNET - Option

OUT :  1 x S/PDIF Coax

Analog Outputs

1 x RCA / 1 x XLR - Balanced

Output Stage

Tube - Class A - ECC83 x 2

Volume & Source Controls

Volume : VRC / Rotary motorized

Source : VRI / Step-less/Relay-less  

Preamp Tone Controls

Treble / Bass / Balance

Direct Output Mode

Tone Control By-pass

Output Stage

Tube - Class A - ECC83 x 2

Headphone Output

Yes / 1/4" 

Remote

Yes

$1,599

Special Offer - $1,439

Features

 

DAC Chip

Burr Brown 24bit / 192kHz 

Digital Filter

UPSCALER - 8 x Upsampling

Digital Outputs

75 ohm - S/PDIF

Digital Inputs 

1 x USB - Main / Back Panel

1 x SD Card & 1 x USB / Front Panel

1 x Optical / Back Panel - Option

Analog Outputs

1 x RCA Coax

Output Stage

Tube - Class A - ECC83 x 2

Remote

Yes

$1,429

Special Offer - $1,299

AMC CDi-vt CD Player

AMC 24192i & 24192i-vt  DAC / PRE

Proprietary Topology Features

VRI - The Rotary Volume Input Topology 

 

A step-less potentiometer switches the source ... no switch or relay. 

 

The fine signals are passed on to the next amplifier stages free of contact-related losses.
 

Only what is not lost at the input stage, can also be restituted at the output stage !

MUSIC

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