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.