MalValve - DAC Four

DAC four digital-analog converter 192 kHz 24 Bit with completely balanced tube stages

Design * Construction . 32 kHz - 192 kHz digital input, 16 - 24 Bit . integrated clock rate converting to 192 kHz - 24 Bit . DAC-integrator stage and DAC-output stage in full tube technique . completely balanced analog signal processing · tube-class A-operation · stepwise adjustable gain · digital and analog transformer-coupling . modular technique for design and control · galvanic isolation by transformer-coupling · equivalent balanced-unbalanced outputs by transformer technique . all switch actions relay-controlled . external switch mode power supply for all supply voltages · on / off muting

Features · Burr-Brown-interface-receiver · Burr-Brown-upsampler · Burr-Brown-digital filter · Burr-Brown-DAC-switch · 4 x digital transformer · 3 x digital cartridge modules · 10 x analog cartridge modules · 2 x digital-analog transformer with MU-metal-shielding · 4 x EF 184-tubes · 12 x ECC88-tubes · 2 x output transformers with MU-metal-shielding · external switch mode power supply 200 VA · control wire preamp four <> power supply four (2 m) · power cable (2 m)

Front panel rotary switches

· front panel rotary switch balanced-unbalanced-unbalanced-optical
· front panel rotary switch mode (8 steps adjustable gain)
· front panel rotary switch phase 0 ° - 180 °
· front panel rotary switch (digital-) filter sharp - soft
· front panel rotary switch (analog-) filter 6dB/12dB/off for low pass
· front panel rotary switch on for on / off

LED-displays

· front right

· front left

red/green
yellow center
red left

red left
red center
red right

operation display
digital filter
display for input signal

48 kHz input signal
96 kHz input signal
192 kHz input signal

Connections * Data

· digital balanced input
· digital unbalanced inputs
· optical input
· wave impedance balanced
· wave impedance unbalanced
· digital unbalanced output
· balanced analog output
· unbalanced analog output
· output impedance
.·output voltage
· total harmonic distortion (THD)
· power supply
· power input
· standby

XLR
Cinch + BNC
Toslink
110 Ohm
75 Ohm
Cinch
XLR
Cinch
< 100 Ohm
2 - 4 V (RMS)
< 0,1 %
90 - 250 VAC, 50 - 60 Hz
90 Watt
0,3 Watt

Connectors

· gold-plated cinch sockets
· gold-plated BNC-socket
· gold-plated XLR-sockets
· Toslink-socket
· AC power socket

Rear panel switches

· toggle switches for balanced or unbalanced analog outpunt

Housing

· 20 mm massive aluminum front plate brushed and black or natural anaodized
· 10 mm massive aluminum chassis brushed and black or natural anaodized
· massive aluminum transformer cover brushed and black or natural anodized
· brass rotary knobs high glass finished and chrome plated

· dimensions:
· weight:

483 mm (W) x 90/140 mm (H) x 395 mm (D)
18 Kg

Netzteil

Power supply

· front-sided operation display
· back-sided AC power connector
· back-sided special plug connector for control wire
· 15 mm massive aluminum front plate brushed and black or natural anaodized
· massive aluminum chassis brushed and black or natural anaodized

· dimensions:
· weight:

263 mm (W) x 315 mm (D) x 100 mm (H)
5 Kg

DAC four

digital-analog converter 192 kHz 24 Bit with completely balanced tube stages