Pioneer - DV-525 CD-afspiller
Nr. 83787667
Pioneer - C-77 forforstærker, M-77 effektforstærker - Stereoanlæg
Nr. 83787667
Pioneer - C-77 forforstærker, M-77 effektforstærker - Stereoanlæg
Up for sale is a very fine-condition Pioneer C77 pre-amplifier and a Pioneer M77 power amplifier from my personal collection.
A rare Japan domestic market model. This is a true heavyweight with exceptional sound quality, featuring inexhaustible power and dynamic range. Not to be confused with the Spec1-Spec2 series.
The devices were serviced about one and a half years ago. The servicing was performed by Retroaudio, who have over 30 years of research, development, and professional experience.
Service details include:
•Replacement of 16 capacitors (with quality enhancements)
•Cleaning of panel connectors
•Replacement of speaker and high-current relays
•Adjustment of AB class bias points
•Replacement of speaker terminals with quality connectors
•Maintenance of all controls
Pioneer M77 Stereo power amplifier:
Circuit system First stage cascade connection differential amplification triple push-pull
Pure complimentary service OCL circuit
Effective power
(Both channel drive, 20 Hz to 20 kHz) 250W + 250W (4 Ω)
250W + 250W (8 Ω)
Harmonic distortion factor (20 Hz to 20 kHz) Effective power : 0.1%
0.05% at 125W output (8 Ω)
1W output (8 Ω) : 0.05%
Cross modulation distortion factor
(50 Hz : 7 kHz = 4 : 1, 8 Ω) Effective power : 0.1%
0.05% at 125W output
0.05% at 1W output
Output Bandwidth (IHF, both channel drives) 5 Hz ~ 30 kHz (Distortion Factor 0.1%)
Frequency characteristic 5 Hz to 80 kHz + 0 -1dB
Input terminal Input : 2V/50k Ω
Output terminal Speaker : 4 Ω, 8 Ω
Damping factor 50 (20 Hz ~ 20 kHz, 8 Ω)
Signal-to-noise ratio 110 dB (IHF, A-network, short circuit)
Semiconductor used Transistor : 55
Diode, Other : 81
Power supply voltage 100 V, 50Hz/60Hz
Power consumption (Electrical Appliance and Material Control Law) 450W
Maximum Power Consumption 1200W
External dimensions Width 480x Height 186.5x Depth 445 mm
Weight 24.3kg
Pioneer C77: Stereo preamplifier
Circuit system Equalizer amplifier : first stage differential 3-stage direct connection, last stage A-class SEPP
Control amplifier section : first stage differential 3-stage direct connection final stage A class SEPP
Input terminal Phono1 : 2.5mV/50k Ω
Phono2 : 2.5 mV to 10mV/50k Ω
MIC : 2.5mV/50k Ω
Tuner, AUX1, 2 : 150mV/100k Ω
Tape Play1, 2 : 150mV/100k Ω
Phono maximum allowable input
(Harmonic distortion rate 0.05%, 1 kHz) Phono1:500mV
Phono2 : 500 mV to 1000 mV
Output terminal Tape Rec1, 2 : 150mV/2.2k Ω
Output (RL : 50k Ω) : 2V/600 Ω, 7V/600 Ω
Harmonic distortion factor (20 Hz to 20 kHz) 0.03% (2 v Output)
0.05% (7 v Output)
Frequency characteristic Phono1, 2 : 20 Hz to 20 kHz ± 0.2 dB
Tuner, AUX, TapePlay : 10 hz to 70 khz + 0 to 0.5 db
Signal-to-noise ratio (IHF, A-network
Short circuit) Phono:74dB
Tuner, AUX, TapePlay : 90 dB
Tone control
(1.5 dB step)
Bass Main : ± 7.5 dB (100 Hz)
Sub : ± 4.5 dB (50 Hz)
Treble Main : ± 7.5 dB (10 kHz)
Sub : ± 4.5 dB (20 kHz)
Filter Low : 15 Hz, 30 Hz (12dB/oct.)
High : 12 kHz, 8 kHz (12dB/oct.)
Attenuator 0, -15, -30dB
Semiconductor used IC : 2
Transistor : 50
Diode, Other : 31
Power supply voltage 100 V, 50Hz/60Hz
Power consumption (Electrical Appliance and Material Control Law) 17W
External dimensions Width 480x Height 186.5x Depth 365 mm
Weight 11.2kg
Please note, a 230V to 110V power converter is required to use these devices.
The devices will be shipped in two packages, carefully packed in double-wall cardboard boxes with foam padding.
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