Denon PMA-880R Integrated Amplifier (SOLD)

Denon PMA-880R
Stereo Integrated Amplifier
Produksi kisaran tahun 1995
Daya : 2 x 75 watts Rms
Kondisi masih bagus , normal dan Original
No remote control
Harga : SOLD
083876467899

Denon DRW-585 Tape Deck (SOLD)

Denin DRW-585
Stereo Cassette Deck
Dobel deck auto reverse , warna gold terlihat mewah
Kondisi masih cukup bagus dan normal
Assembly meda in China
Harga : SOLD
083876467899

Vintage Tuner Kenwood KA-5550 AM/FM Tuner (SOLD)

Vintage Kenwood KA-5550
Analog Stereo Tuner AM/FM
Untuk penerimaan gelombang cukup peka , akan tetapi pada posisi tombol stereo suara tidak terlalu bersih , jika pada posisi mono suara cukup bersih (apakah mungkin masalah antena yang kurang bagus saya belum coba karena saat coba hanya pakai kabel buat antena nya)
Size nya tidak teralu lebar tapi cukup tebal model casingnya
Made in Japan
Harga :  SOLD
083876467899

New Collections...Mcintosh MC 2125 (SOLD)

dilapisi plastic supaya cat dan tulisan tetap utuh

Mcintosh MC 2125
Stereo Power Amplifier
Daya : 2 x 125 Watts
Tahun produksi : 1976-1981
Output : 2.4.8 dan 16 Ohm
Berat : 65 lbs 
Kondisi masih bagus ,mulus normal dan ORIGINAL
Kelebihan power Mcintosh ini menurut saya adalah mempunyai impedance keluaran yang flexible dimana bisa dipakai untuk 2,4,8,dan 16 ohm yang tidah dipunyai oleh amplifier merk lain
Jadi keluaran menggunakan Travo output seperti amplifier tabung
Made in USA
Mcintosh ,nama yang sudah tidak asing lagi bagi telinga para audio Lover, brand kelas hi-end yang sudah cukup lama bermain di dunia audio dengan produk-produk berkelas dan cukup diminati
Akhir-akhir ini sudah mulai jarang beredar produk Mcintosh dipasaran audio 2nd, sudah semakin langka dan semakin mahal .
For serius Collector
Harga : TERJUAL (SOLD)
083876467899

data from web :

12

McIntosh MC2125

566,000yen(around the 1980 time)

Description 　 Stereo power amplifier carrying a power guarding system original with a mac. If an output wave is electrically compared with an input wave and the wave difference becomes 0.5%, a Limit lamp will light up and a Normal lamp will go out in the circuitry which realized the power guarding system by the wave comparator of the mac original design. Moreover, if a wave difference reaches to 1%, the power guarding circuitry operates, it will prevent amplifier carrying out clipping, and distortion will not be reproduced from a speaker, but a speaker will be protected simultaneously. An input wave and an output wave are compared by IC differential amplifier, and the wave difference by distortion of an output wave is changed into a voltage. Moreover, this voltage is amplified about 100 times and supplied to a Schmidt trigger circuit through a full wave rectifier circuit. Moreover, this voltage uses a power guarding circuitry, and if it becomes higher than the level which a voltage makes turn on a Limit lamp, it will operate a power guarding circuitry. The Limit lamp is designed switch on the light also when amplifier overloads, and even if overload status is very short, it is turned on between the grades which can be viewed. In this case, meter displays 200W cuttlefish. To use a power guarding circuitry, it is necessary to set the power guarding switchpoint of a rear surface panel to Normal. Even if this switchpoint is in the location of out, only the Limit lamp operates. The output signal of amplifier is supplied to an output-terminal through an output transformer. This transformer is designed match sy copy power termination of every impedance, and even if it uses which output-terminal, the maximum output is obtained to all the signalling frequencies. Moreover, a transformer eliminates that component and this transformer prevents a corruption of a speaker, when it also has the role which protects a speaker in the case of a malfunction of amplifier, for example, a direct current component mixes in an output. In order to prevent an output transistor overloading, the output signal is always supervised in the monitor circuitry. This circuitry will become a high impedance if an Output voltage becomes more than a rate. When an output becomes a upper, the signal supplied to an output transistor by the monitor circuitry is restricted, and prevents a corruption of an output transistor. Two output window meter is carried. If there shall be a tick mark of a watt and a decibel in meter and the thumb of a meter range shall be 0dB or -20dB, the peak value of a signal will be displayed on a decibel tick mark, and if a thumb is set to WATTS, an output will be displayed on a watt tick mark. The tick mark shows the output of the sinusoidal signal by the average, and the peek of a signal also judges it from this tick mark. For example, the tick mark of 120W shows that the moment peek of a signal is 240W. Moreover, it is also possible to fix and read meter to a upper by a peek hold facility. The monolithic transistor differential amplifier with few noises to the input side of a power amplifier part was used, and distortion is removed. An input signal and a feedback signal are supplied to this differential amplifier. The circuitry of the following stage is a voltage amplifying circuit which operates with a Class-A. A driver circuitry and an output circuit adopt a complimentary scheme, carry out the operation near a Class-A, and lessen crossover distortion. To the transition of a temperature, this circuitry is designed so that a moderate bias may always start. The power transistor serves as AB class operation, and, as for the bias current, the safeness is maintained with the thermistor. The output circuit has adopted the para-push scheme of a single ended, and consists of six reliable complimentary power transistors. For the equilibrium nature Emitter-Follower join, a stability is good, and distortion's has decreased and this circuitry is carrying out B class operation without crossover distortion by adoption of the still more original output bias circuitry.

Rating of a mode

Form	Stereo power amplifier
Output power	stereo: 120W+120W 15.5Vrms (at the time of a 2-ohm load intensity) 21.9Vrms (at the time of a 4-ohm load intensity) 31.0Vrms (at the time of an 8-ohm load intensity) 43.8Vrms (at the time of a 16-ohm load intensity) mono: 240W 15.5Vrms (at the time of a 1-ohm load intensity) 21.9Vrms (at the time of a 2-ohm load intensity) 31.0Vrms (at the time of a 4-ohm load intensity) 43.8Vrms (at the time of an 8-ohm load intensity)
Output load impedance	stereo: 2 ohm, 4ohm, 8ohm, 16ohm mono: 1 ohm, 2ohm, 4ohm, 8ohm
Output-power band	20Hz - 20kHz
THD	0.1% or less (at the time of Outputs 0.25W-120W, 20Hz - 20kHz, and both channel operation)
Cross modulation distortion	0.1% or less (at the time of an Output power)
Frequency characteristic (at the time of 1W output)	20Hz-20kHz+0 -0.25 dB 10Hz-100kHz+0 -3.0 dB
SN ratio	95dB or more (at the time of an Output power)
Output voltage	25V
Dumping factor	stereo: 16 (2ohm), 50 (4ohm), 20 (8ohm), 14 (16ohm) mono: 16 (1ohm), 50 (2ohm), 20 (4ohm), 14 (8ohm)
Input sensitivity/impedance	0.75V, 2.5V (switching type) / 100kohm
The semiconductor used	Silicon transistor: 45 pieces IC: Eight pieces Silicon diode: 45 pieces
Supply voltage	AC120V, 50Hz/60Hz
Power consumption	50W (at the time of a non-signal) 460W (at the time of a maximum rating output)
Dimensions	Main unit: Width 381x height 127x depth of 330.2mm Front panel: Width 406.4x138.1mm in height
Weight	29.5kg (net) 35.0kg (at the time of an original packaging)

0w/ch. (240w mono). Response 20-20kHz (+0 -0.25dB). Distortion 0.1%. Noise and hum -95dB. Output impedance 2, 4 8 and 16 ohms. (1, 2, 4 and 8 ohms in mono). Damping factor 14 or greater. Input impedance 100k. Input sensitivity 0.75v or 2.5v. Headphone impedance: low. Sentry Monitor. Power Guard. FRONT PANEL: Glass panel with black & gold escutcheon. Illuminated. Power level meters (linear watts or dB). Gain controls, Meter range sw: -20, -10, 0, watts and hold. Output mode lamps: normal or limit. Speaker sw: on or off. Power sw: on or off. Headphone jack.
BACK PANEL: Output barrier strips. Audio inputs. AC outlet. Input level sw: 2.5v or .75v. Mode sw: stereo or mono. Power Guard sw: normal or out. Fuse. Panloc mounting.
Size 5-7/16"H, 16"W and 14-1/2"D. Weight 65 lb. Sold from 1976-1981. Last retail price $1199.00

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