Pioneer A-616

Commentary

This is a stereo pre-main amplifier designed to minimize signal paths, eliminate vibration and resonance, and improve speaker drive performance at low load.

The input block is designed to minimize signal routing, and the volume and power amplifier are directly connected when the source / direct switch is turned ON, so you can enjoy more pure sound.
The power amplifier block is laid out along the signal flow to minimize the distance from the power supply.
In the speaker selector block, the relay board and the speaker terminal are connected directly to reduce unnecessary wiring.

A honeycomb shape with high rigidity and excellent vibration damping is adopted everywhere, and vibration is dispersed and damped in many directions, while vibration distortion noise is kept low by high rigidity.
In addition, the honeycomb heat sink of the chimney type has an excellent heat radiation effect.
In addition, we have adopted a honeycomb structure for the insulator to reduce vibration from outside.

The volume has a balanced structure that reduces the mechanical stress of the volume body and uses a floating structure to minimize the effect of vibration.

Non-switching circuit TypeII which further expands the region of 0 switching distortion is adopted.
This greatly improves thermal distortion and non-linearity of the output stage.

NF-CR type is used for the Phono equalizer.

An extremely thick oxygen-free copper power cord with polarity display is used to prevent power line noise from entering.

A vise type speaker terminal is used to supply current with low loss.

It uses a fuse for audio with an emphasis on sound quality and a rotary knob made of solid aluminum machined.

Model Rating

Type	Stereo pre-main amplifier
Rated output (Both channel drive, 20 Hz to 20 kHz)	120W + 120W (4 Ω, 0.008%) 100W + 100W (6 Ω, 0.005%) 90W + 90W (8 ohm, 0.005%)
Input Sensitivity / Impedance	Phono MM : 2.5mV/50k Ω Phono MC : 0.2mV/100 Ω CD, Tuner, Line, Tape : 150mV/50k Ω
Maximum Allowable Input (1 kHz, 0.008%)	Phono MM:200mV Phono MC:19mV
Frequency characteristic	Phono MM : 20 Hz to 20 kHz ± 0.2 dB Phono MC : 20 Hz to 20 kHz ± 0.3 dB CD, Tuner, Line, Tape : 1 hz to 150 khz + 0 to 3 db
S/N ratio (IHF, A-network Short circuit)	Phono MM : 89 dB at 2.5 mV Phono MC : 71 dB at 0.25 mV CD, Tuner, Line, DAT/Tape1, 2 : 108 dB
Power supply voltage	100 VAC, 50Hz/60Hz
AC outlet	Power switch interlock : 2 systems (150W) Power switch not linked : 1 system (100W)
Power consumption (Electrical Appliance and Material Control Law)	220W
External dimensions	Width 420x Height 162x Depth 435 mm
Weight	14.4kg