Denon pma 255

Vabricko stanje, 1975 god

Type Pre-main amplifier

Power Amplifier Unit

Circuit system Pure complimentary service all-stage direct connection 2 power supply OCL circuit

Adoption of last stage silicon triple-diffused mesa transistor

Dynamic Output (IHF) 260W (130W + 130W, 4 Ω)

164W (82W + 82W, 8 Ω)

Rated output

(Both channel drive, sine wave continuous output)

1kHz:

20 Hz to 20 kHz : 65W + 65W (4 Ω)

60W + 60W (8 Ω)

58W + 58W (4 Ω)

55W + 55W (8 Ω)

Total harmonic distortion factor 0.08% or Less (at Rated Output)

Cross modulation distortion factor 0.1% or Less (at Rated Output, 60 hz : 7 khz = 4 : 1)

Power Band With 4 Hz ~ 45 kHz (IHF, both channel drive)

Frequency characteristic 4 Hz ~ 200 kHz + 0 -1dB

Input sensitivity 1Vrms

Input impedance 80k Ω

Output impedance 0.16 Ω or less

Residual noise 0.3 mVrms or less

Output terminal Speaker terminal : 4 Ω ~ 16 Ω, A/B

Headphone terminal : 4 Ω ~ 16 Ω

Preamplifier Section

Input Sensitivity / Impedance Phono1 : 2.3mV/60k Ω

Phono2 : 2.3mV/100k Ω

Tuner, Aux1/2, Tape2 : 200mV/100k Ω

Tape1 : 200mV/70k Ω

Rec/PB in:500mV(Din)

● Equalizer amplifier (Phono-Rec out)

Circuit system NPN transistor 3-stage direct connection E-E negative feedback type

Maximum allowable input 200 mVrms or More (1 kiHz)

Maximum power output 25Vpeak

Rated output 200mVrms

Total harmonic distortion factor 0.02% or Less (1 kHz, Rated Output)

Rec Out Compatible Load Impedance 100k Ω or more

RIAA deviation Phono1/2 : 20 Hz to 20 kHz + 0.1 -0.2 dB

● Control amplifier (Aux-Pre out)

Circuit system NPN transistor 3-stage direct connection E-E negative feedback type

Total harmonic distortion factor 0.02% or Less (1 kHz, Rated Output)

Pre-out applicable load impedance 100k Ω or more

Frequency Response (at Tone Defeat) 5 Hz to 100 kHz + 0 -1dB

Tone control Bass : 100 Hz ± 10 dB, Turnover frequency 640 Hz

Treble : 10 kHz ± 10 dB, Turnover frequency 1.6 kHz

Filter characteristic Low : 20 Hz, 12dB/oct.

High : 9 kHz, 12dB/oct.

Loudness control (1 kHz) Low: +8.5dB(100Hz)

High: +4dB(10kHz)

Muting (level at 0 dB) -10, -20dB

< General>

Transmission frequency characteristic Phono-speaker out : 20 Hz to 20 kHz + 0. 1-0. 3 dB

Aux-speaker out : 20 Hz to 20 kHz + 0 to 0.15 dB

Total harmonic distortion factor 0.1% or Less (Phono-speaker out, 20 Hz to 20 kHz)

Signal-to-noise ratio

(IHF, input short circuit, A-network) Phono1/2 : 75 dB or more

Tuner, Aux1/2, Tape1/2 : 85 dB or more

Channel separation 70 dB or More (1 kHz)

55 dB or More (20 Hz to 20 kHz)

Power outlet Switched : 2 systems, 250W

Unswitched : 1 line, 150W

Pwer 100 VAC, 50Hz/60Hz

Power consumption (Electrical Appliance and Material Control Law) 140W

External dimensions Width 396x Height 147x Depth 281 mm

Weight 11.2kg

Sold Separately Wood Cabinet ACA-5 (¥ 5,000)