NRPavs   SOLD items 2016 archive 1  Proton  D540  stereo  amplifier  details
SOLD items 2016 archive 1 product details : 
Proton  D540
stereo  amplifier

SOLD
 
 
Proton  D540   stereo  amplifier
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   SOLD January 2016 on trademe  to Kaitaia
S/N: PD54014801
 
 
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                 Proton  D540 stereo amplifier - dark  grey :

Features :
  • 1987 vintage 40W bridgeable stereo amplifier
  • No remote control


  • In 1987 the D540 won "Audio/Video International" magazine's Hi-Fi Grand Prix award
  • The Proton D540 is driven by dual power supplies with Proton's dynamic power on demand technology, which increases headroom
  • In a 100 ms test, the amplifier drives 150 watts per channel to an 8 ohm load, 220 watts per channel to a 4 ohm load and 230 watts to a 2 ohm load,  which is 6 dB of headroom
  • The D540 has outputs for two sets of stereo speakers [A and B]
  • The frequency response curve is from 20Hz to 20 kHz, ± 0.2dB.  At the rated power level, the total harmonic distortion is 0.02 percent,  and the intermodulation distortion is 0.06 percent
  • Both distortion levels are so low as to be practically negligible
  • The damping factor is 90 indicates tight control of difficult speaker loads
  • The amplifier has a MM / MC phono input, radio tuner, video, digital audio and two tape inputs with multi-directional dubbing
  • The phono preamp has a switchable setting for low-output MC phonograph cartridges or high-output MM cartridges,  as well as three-way adjustable capacitance for setting the response of the preamp
  • The amplifier is bridgeable, [both channels can be used to drive a common mono load]
  • The D540 has NAD's anti-clipping circuit


Specifications :
  -:®:-    1987 vintage
  -:®:-    Power : 40W RMS at 8 ohms with THD distortion 0.02%
  -:®:-    Dynamic Power [at 8ohms / 4ohms / 2ohms, 20ms]: 160W / 280W / 380W
  -:®:-    Dynamic Power [at 8ohms / 4ohms / 2ohms, 100ms]: 150W / 220W / 230W
  -:®:-    Clipping power [at 8 /4 / 2ohms] : 50W / 80W / 100W
  -:®:-    Dynamic headroom : 6dB
  -:®:-    Damping factor : 90
  -:®:-    Preamp in / outs   can be used a separate preamp or as a power amplifier
  -:®:-    Phono : MM / MC  moving magnet and moving coil - rear switched
  -:®:-    Frequency response : 20 to 20kHz ± 0.2dB
  -:®:-    Power bandwidth at THD 1% : 10Hz to 60kHz
  -:®:-    High level input resistance / capacitance : 40kohm / 220pF
  -:®:-    Line input sensitivity : VIDEO / tape play: 100mV,  phono MM: 2.5mV,  MC [high/low]: 0.2mV / 0.1mV
  -:®:-    Residual noise : 0.4mV
  -:®:-    Channel crosstalk [1kHz] : 90dB / function crosstalk: 80dB
  -:®:-    Signal to noise [unweighted] : Tape / DAD: 90dB,  Phono MM: 80dB,  MC: 68dB
  -:®:-    Bass / Treble : ± 9dB at 100Hz / 10kHz
  -:®:-    Loudness at -30dB : +6dB at 100Hz,  +3dB at 10kHz
  -:®:-    Phono input resistance [MM/MC] : 47kohm / 100ohm
  -:®:-    Phono input capacitance [selectable] : 100pF / 200pF / 320pF
  -:®:-    Phono overload [MM] at 20Hz / 1kHz / 20kHz : 28mV / 280mV / 2.8V
  -:®:-    Phono THD at 4.5V output [MM/MC] : 0.01% / 0.03%
  -:®:-    RIAA response accuracy [MM/MC] : ± 0.2dB / ± 0.5dB
  -:®:-    Speaker outputs : A,  B,  A + B
  -:®:-    Tone controls : Bass,   Bass EQ  Treble  Loudness
  -:®:-    Dimensions [W x H x D]: 420 x 87 x 320mm
  -:®:-    Weight : 8.7kg  - packed weight ~ 10kg


   SOLD January 2016 on trademe  to Kaitaia












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