 | SOLD items 2014 archive 1 product details :
Proton D540
stereo amplifier
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| Proton D540 stereo amplifier | Proton D540 stereo amplifier : controls cover open |
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| Proton D540 stereo amplifier : recessed controls view | Proton D540 stereo amplifier : back view |
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| Proton D540 stereo amplifier : top view | Proton D540 stereo amplifier : size scale |
| SOLD May 2014, from Oldies but Goodies, to Ngararatunua, Whangarei | S/N: PD54014801 |
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Proton D540 stereo amplifier specifications Back to NRPavs Home
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, and it has 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, ± 0.2 dB. 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]
Amplifier has an 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 May 2014 from Oldies but Goodies, to Ngararatunua, Whangarei
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