Pioneer A-777 specifications

External differences from the A-757 MKII: Golden dot now on the volume potentiometer, input and output selector switch. Inside: now vertically mounted boards, thus a clear view through the base plate, which no longer consists of copper, now also no honeycomb housing around the relay section and the RCA boards. No more type designations on the cast housings of the transformers.

General

Connections

Technical data

Special features

Previous model:

Successor model:

Amplifier always connected since 1991. Total term 27 years (3 interruptions due to relocation). Opera ted at Warfedale boxes. First repair in 2018 (defective current changing modules on the housing). Still in operation after 3-day repair (cost: € 60,-). First owner!

manufacturer: Pioneer
model: A-777
year of construction: 1991 to 1993
Made in Japan
color: black
type: Analog
remote control: no
power consumption: 820 W
dimensions: 420 x 162 x 435 mm (WxHxD)
weight: 19 kg
factory price approx.: 1.300,-DM

number of inputs:
- Phono (MM/MC selectable): 2,5 mV / 50 K-ohms (MM), 0.2 mV / 100 ohms (MC)
- CD, Tuner, Line, 3x Tape, Adapter In: 150 mV / 50 K-ohms
number of outputs:
- 3x Tape Out, Adapter Out: 150 mV / 2.2 K-ohms
- headphone (6.3 mm Jack, front)
- 2 pairs of Speakers

Phono (MM/MC selectable): 2,5 mV / 50 K-ohms (MM), 0.2 mV / 100 ohms (MC)
CD, Tuner, Line, 3x Tape, Adapter In: 150 mV / 50 K-ohms

3x Tape Out, Adapter Out: 150 mV / 2.2 K-ohms
headphone (6.3 mm Jack, front)
2 pairs of Speakers

continuous power
- 8 Ohm : 2x 110 W / 0,007%
- 4 Ohm : 2x 155 W
dynamic performance
- 8 Ohm :
- 4 Ohm : 2x 240 W
total harmonic distortion: 0,007% (20-20.000 Hz, 95 W, 8 Ohm )
damping factor: 150 / 70 (8 Ohm s, 1 kHz / 20-20.000 Hz)
frequency response:
- Phono MM: 20 - 20,000 Hz (±0.2 dB)
- Phono MC: 20 - 20,000 Hz (±0.3 dB)
- high level: 1 - to 150,000 Hz (+0/-3 dB)
signal-to-noise ratio:
- IHF (short-circuited, A-weighted)
  - Phono MM/MC: 94 dB / 76 dB
  - high level: 110dB
- DIN (continuous power/50 mW)
  - Phono MM: 74 dB / 68 dB
  - high level: 92 dB / 70 dB
stereo channel separation:
control:
- Bass: Yes, ±8 dB (100 Hz)
- height: yeah, ±8 dB (10 kHz)
Loudness: Yes sound, +5 dB (100 Hz), +3 dB (10 kHz) (at -40 dB volume)
High Filter : no
Low Filter (Subsonic): Yes, 17 Hz (-12 dB/oct.)
Mute: Yes
Direct/Line-Straight: Yes

8 Ohm : 2x 110 W / 0,007%
4 Ohm : 2x 155 W

8 Ohm s:
4 Ohm : 2x 240 W

Phono MM: 20 - 20,000 Hz (±0.2 dB)
Phono MC: 20 - 20,000 Hz (±0.3 dB)
high level: 1 - to 150,000 Hz (+0/-3 dB)

IHF (short-circuited, A-weighted)
- Phono MM/MC: 94 dB / 76 dB
- high level: 110dB
DIN (continuous power/50 mW)
- Phono MM: 74 dB / 68 dB
- high level: 92 dB / 70 dB

Phono MM/MC: 94 dB / 76 dB
high level: 110dB

Phono MM: 74 dB / 68 dB
high level: 92 dB / 70 dB

Bass: Yes, ±8 dB (100 Hz)
height: yeah, ±8 dB (10 kHz)

Pioneer A-7 57 MK II

Other models from the same series:
Pioneer A-22 7
Pioneer A-33 7
Pioneer A-44 7
3498f73c37688adb1a96fc0533245fad 56 MK II
Pioneer A-7 57 MK II
Pioneer A-8 58

Pioneer had at the time, starting from the A-717, a whole series of amplifiers of the same basic concept of print: Solid design with consistently sized components, which was reflected in the weight low. The durability is enormous, so that most of the amplifiers that are still available used today work absolutely flawlessly. In particular, the typical scratching of old switches and potentiometers is rather rare here. From 7x7 the amplifiers have two transformers in the power supply. However, these do not serve as usual for the separate supply of the two stereo channels, but provide the positive and the negative operating voltage of the output stages.

Although the amplifiers have two connection pairs on the back, each connected by a wire bridge, they have none on separable pre- and power amplifiers. Rather, this so-called adapter connection is located in front of the volume control and tone control stage. That's why you can use the Pioneer amplifiers as power amplifiers for other preamps, but you can't connect the Pioneer preamps to other power amplifiers.

The sound of these amplifiers can be described as warm, powerful and precise compared to similar amplifiers from other manufacturers, although perhaps the last bit of precision is missing compared to devices that are several times more expensive. The devices must be certified as having an excellent price - performance ratio, especially with the used ones available today, which are technically always in new condition.

The amplifiers of the A-656 to A-757 series, possibly also later models, have only one real weak point: a capacitor in the protection and turn-on delay circuit breaks, after which the speaker relays turn on with a delay and then buzz for a while. The repair should cost about € 50 in a specialist company, plus 80 cents in material costs.

Pioneer A-777