밑에 분이 소니의 TA-5650을 사용하신다고 하여, 정보를 올려보겠습니다.





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스펙


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POWER: 2x 70W (IHF, 4Ohm)


2x 80W (IHF, 8Ohm)


Continuous RMS: 2x 50W (20...20kHz, 8Ohm)


Frequency response:5Hz...40kHz


Bandwidth:2Hz...100kHz (-2dB)


THD:0,1% (rated power)


0.08% (1W)


Damping factor:50 (8Ohm/1kHz)


S/N ratio:110dB


Residual noise:0,02µW


S/N ratio:70dB (Phono)


90dB (Tape, Aux)


RIAA deviation:-0,2dB


Inputs: 2x Phono (2,5mV/50kOhm)


3x Aux


1x Tuner


2x Tape (150mV/250kOhm)


Outputs: 2 loudspeakers pairs (4Ohm min.)


2x Tape (150mV/4,7Ohm)


1x DIN (17mV/42kOhm)


PRE OUT (150mV/47kOhm)


headphones


Bass controls: ±10dB@100Hz or 50Hz


(turnovers: 500Hz or 250Hz)


Treble controls: ±10dB@10kHz (turnover: 2,5kHz)


±6,5dB@ 20kHz (turnovers: 5kHz)


Low filter:12dB/oct. above 30Hz


High filter:12dB/oct. below 9kHz


Loudness:+10dB@50Hz, +3dB@10kHz


Componentry:10 V-FETs


8 FETs


42 transistors


31 diodes


PC : 440Watt


Dimensions:43 x 16,8 x 32,3cm


Weight:12,5kg





공개되어 정보를 보더라도 꽤 좋은 앰프이네요.

















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TA-5650 설명글


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FEATURES





Conservatively rated at 50WPC into 8 ohms, the 5650 drives two speaker pairs (4-16 ohm single pair, 8-16 ohms both pairs), and quite easily drives 4 ohm speakers, being capable of delivering nearly triple the rated power into such loads on a dynamic basis.





The preamp section leaves very little to be desired - the only thing missing is a detent in the center position of the balance knob! For good measure, it also includes two 'processor loops', at a point right before the volume and filter sections of the amp. These can also be used as extra inputs, with the only exception that you cannot record from them.





The power and pre sections are separable by removing the jumpers on the rear panel. The versatile preamp section continues with defeatable tone controls, two selectable turnover frequencies each, high and sub filters, loudness, and mono mode switch. The volume section offers a -20dB muting switch and a unique volume pot with a coaxial adjustable detent mechanism, used as a volume preset level.


The preamp section is extremely silent for line level inputs (easily 100dB, miles ahead of the competition at the time), and not far behind for the phono input. The power amp gains about 8/10dB over that when fed from a low impedance output!





The front panel is a forged zinc-aluminium alloy piece, again typical of the times as paint technology for light metals was not as good as it is today. Another quality point: tone controls are switched attenuators instead of regular pots. The chasis is heavy gauge steel, with alumimium front. It is interestingly constructed for easy service - loosening the side screws allows the front and the rear panel to tip down inside retaining grooves - everything stays connected and all test points are accessible. Very convenient, and very old school!











QUALITY





The construction of this amplifier is quite unique - some very neat tricks it uses have apparently been forgotten since it was made! This particular amp has a relatively standard differential BJT front end, but without the 'savings' in the tail current source - so many manufacturers, even today, put a simple resistor there and generate far too much noise. A simple VAS stage follows, and here is where all similarity to 'standard' ends.





The power section is laid out as a voltage and current amplifier, with the VFETs connected in a manner triodes would be in a tube amp - with the difference that complementary VFET devices are used, so no output transformer is necessary.


The build quality, and execution of the idea in general, leaves very little to be desired. Of special note is a laminar convection cooling system - note shiny 'shields' in the picture of the interior. These are actually the 'chimneys' for the special compact but large area microforged and machined heatsink mounted on the bottom plate.





The VFETs are socketed and accessible by removing a perforated panel on the bottom of the amp. The 'chimneys' prevent the warm air streaming through the bottom vents and through the heatsink fins from forming vortices inside the case, which lowers the effectiveness of the heatsink. They direct the warm air straight up through the top cover vents. The chimney effect ensures that local swirl happens when the air has already passed the heatsink fins, and is well contained. This results in nearly laminar flow and increases the cooling effect signifficantly over free air mounted heatsinks - the literature quotes 50% to 80% improvement!. This is quite handy as the amp uses fairly high standing current and runs quite warm even without signal.





The wiring inside is all solid core, and is very thoughtfully laid out. A large power transformer and 20.000uF worth of filter caps form the capable power supply. The amp also implements a full overcurrent, DC voltage and overtemperature protection, including an anti-thump delay on power-up. Another unusual point for an amplifier of this vintage: with such age, it is very typical for amplifiers to develop dry joints. Both this 5650 and a 5550 I also have, are in my experience unique for not having even one dry joint after all these years - the soldering and the printed circuits, though standard FR2 material (typical for the vintage) are of very high quality.











좋은 앰프입니다. ^^