WELTRONICS

AMC

The awakening of a Sleeping Beauty
 
Peter Bath and Malcolm Blockley, 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.
"There is absolutely no doubt in our mind that both the AMC tube amplifiers and the solid state Sanken mosfet amplifiers are some of most astounding values out there today ... no doubt at all ! "

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

Solid State - Class A / Discrete

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 - $1,519

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

$1,449

Special Offer - $1,349

AMC CDi-vt CD Player

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AMC 24192i & 24192i-vt  DAC / PRE

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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 !

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