Mal Valve
HighEndHifi
D. Mallach
Towersgarten 11
45239 Essen
Germany

Tel +49-(0)201-408084
Email: info@malvalve.de


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Preamp Four Phono Mk 7

completely balanced preamp

  
Preamp4PH-vorne
  

Design * Construction

. full tube technique in signal path
· MC- and MM-operation
· low noise phono input signal
· passive phono pre-emphasis
· RIAA-phono de-emphasis stepwise switchable for different cut off frequencies
· switchable input impedances for MC- and MM-operation
· 3-step MC-adjustment by switchable transmission ratio
· balancing of unbalanced input signals
· fully balanced signal processing in all modes and connection configurations
· pure class A-operation
· equaly balanced-unbalanced in-/outputs by transformer technique
· galvanic isolation by input and output transformer coupling
· cartridge modul technique
· all switching processes relay-controlled
· flexible switching functions by processor control
· external switch mode power supply for all supply voltages
· on / off muting

 

  
Preamp4L-innen
  




Features

· 4 x ECC 808-tubes
· 8 x EF184-tubes
· 6 x ECC 81-tubes
· 8 x ECC88-tubes
· 17 x circuitry cartridge module
· 2 x MC-transformer with MU-metal-shielding
· 2 x MM-transformer with MU-metal-shielding
· 2 x output transformer with MU-metal-shielding
· external switch mode power supply 200 VA
· remote control
· control wire preamp four phono <> power supply four(2m)
· power cable (2 m)

Preamp4PH-Stimmung
  

Front panel rotary switches

· phono
phono 1 = MM, MC 1 - 3
phono 2 = MM, MC 1 - 3
· impedance
phono 1
· mode
phono 1 for choosing the RIAA-phono-cut off frequency
· impedance
phono 2
· mode
phono 2 for choosing the RIAA-phono-cut off frequency
· on
on / off



LED-display

· front right



· front left


red/green
red center
red left 

red left  
red center 
red right
red all


operation display
phono 2
phono 1

transformation ration MC 1:5
transformation ration MC 1:10
transformation ration MC 1:20
MM


 
Preamp4PH-hinten

Specifications

· balanced input
· unbalanced input
· input impedance MC
· input impedance MM
· input sensivity MC
· input sensivity MM
· phono equalization
· balanced output
· unbalanced output
· output impedance    
.·output voltages
· total harmonic distortion (THD)
· frequency response
· signal-to-noise ratio  MC
· signal-to-noise ratio  MM               
· power supply
· power consumption
· Standby   



phono 1 + 2
phono 1 + 2
100 - 800 Ohm
10 - 100 kOhm
0,1 - 0,2 - 0,4 mV
1 mV
22 µs - 83 µs
Preamp Out
Preamp Out
< 100 Ohm
2 V (RMS)
< 0,1 %
10 - 80.000 Hz
> 70 dB (A)
> 80 dB (A)
90 - 250 VAC, 50 - 60 Hz
90 Watt
0,3 Watt

Connectors

· gold plated cinch sockets
· gold plated XLR-sockets
· gold plated 2 mm-sockets (ground)
· special connector for control wire

Rear panel switches

· toggle switch for balanced or unbalanced phono 1-input
· toggle switch for balanced or unbalanced phono 2-input
· toggle switch for balanced or unbalanced phono output


Options

· front plate / chassis natural anodized


Amplifier housing

· 20 mm aluminum front plate brushed and black or natural anodized
· 10 mm brushed and black or natural anodized aluminum chassis
· massive aluminum transformer cover brushed and black or natural anodized
· brass rotary knobs and product badge high-glass polished and chromed
· dimensions: 
· weight:
483 mm (W) x 395 mm (D) x 90/140 mm (H)
18 Kg

 

 

Netzteil

Power supply

· front-sided operation display
· back-sided AC power socket
· back-sided special connector for control wire
· 15 mm massive aluminum front plate brushed and black or natural anodized
· brushed black or natural anodized massive aluminum chassis
· dimensions: 
· weight:
263 mm (W) x 315 mm (D) x 100 mm (H)
5 Kg