Informationen gesucht über Onkyo Model 732 und Boxen DF 25 C

+A -A
Schaut ab und zu mal vorbei
#1 erstellt: 01. Mrz 2006, 23:43
Ich würde gerne mehr über die oben genannten Komponenten erfahren, ich weiss nur dass der 732 in Venezuela gekauft worden ist und ca. 20 - 30 Jahre alt ist. Sämtliche Anschlüsse befinden sich auf der Oberseite unter einem durchsichtigen Deckel.
Vielen Dank vorab!
#2 erstellt: 02. Mrz 2006, 14:44
dieser Verstärker war wirklich schwer zu finden. Hier gibt's ein Bild und ein paar technische Daten:
Ist das der Richtige? Von Anschlüssen auf der Oberseite ist nichts zu sehen.
Schaut ab und zu mal vorbei
#3 erstellt: 02. Mrz 2006, 18:38
Hallo Martin,

Danke für die Mühe, aber diese Seite habe ich auch gefunden.
Auf meinem Verstärker steht aber nicht integra, sonder nur model !
Ansonsten ist er denke ich baugleich. Jedenfalls hat der integra diesselbe Front wie meiner.
Ist häufiger hier
#4 erstellt: 03. Mrz 2006, 01:09
Hi Ich hatte letzens mit Dirk Gardi kontakt.

Der hat ein recht grosses online Arhiv von Onkyo Katalogen und
Jedoch verlangt er für den Zugang eine Spende in Form von Onkyo Bedienungsanleitungen,Broschüren oder sowas.Falls nicht gar eine kleine Geldspende

Aber er hat ein grosses Archiv ,du könntest ihm mal anfragen ob er in seine Unterlagen mal nachschaut ob er einen Katalog zu deinen Verstärker hat.

[Beitrag von nobodysdarling am 03. Mrz 2006, 01:10 bearbeitet]
#5 erstellt: 03. Mrz 2006, 11:33
Hallo Hannes.

aus dem unergründlichen……. no Problem, ein Griff in den Onkyo Ordner in meinem bescheidenen Archiv,
hier einige Infos zum Model 732, nicht zum Integra 732 und das ganze auch noch kostenlos.

Quelle: Onkyo Prospekt

Model 732 with newly discovered amplifier design
Amplify the Input signal without any distortion! This is the most fundamental theme that runs through all efforts when designing an amplifier. But what is distortion and how is it produced? lf these questions are not answered it is impossible to create a really excellent amplifier. Of course, every amplifier is designed to reduce distortion. In an ordinary amplifier the distortion is measured by feeding a sine wave into the amplifier. However, this wave form is very rare in real music. Usually live music has many loud and abrupt sounds. They are an integral part of good music but it is this very dynamic sound that causes much distortion due to the poor transient response of many amplifiers. Even if an amplifier has a T.H.D. of, for example, 0.01 % at 1 KHz it does not mean that this amplifier can reproduce music with low distortion. If we consider the `'live signal" we find it very complicated and man, without some help cannot analyse it very satisfactorily. That is the reason Onkyo resorted to electronic Computer technology to analyse each signal. This Computer technology was combined with extensive listening tests in an effort to discover just what distortion is and how it is caused. The result of this research enabled Onkyo to establish a new method for the design of an amplifier. Consequently, model 732 has precise equalization, big phono overload capacity, direct coupling, differential amplifier and pure complementary SEPP circuitry.
Preamplifier Section
Equalizer Stage
Transient response is a problem left by many preamplifiers because their
calculations depend an the input being a sine wave, However, this simple wave is quite different from the complex signal produced by live rnusic. As is well known live music contains many very abrupt and impulsive sounds and has an unbelievably wide dynamic range. This dynamic signal causes distortion in all circuits and must be taken into consideration when designing equipment. in Fig (A) a sine wave and an impulse wave are simultaneously fed into an amplifier with an ordinary equalizer. The wave form is distorted with the cause being poor transient response Fig. (B) shows the same wave forms fed into model 732. The wave form is like one reflected in a mirror. This means that model 732`s reproduction is faithful to the original rnusic because it avoids the distortion caused by poor transient response. CAD (Computer Aided Design) is used in model 732 because it is impossible to analyse dynamic music signals with ordinary measuring instruments. By comparing extensive listening tests and the measurements of computers Onkyo was able to discover just what the distortion was and through this research established a new method of designing an amplifier.
In a preamplifier precise equalization is extremely important. To avoid distortion that is caused by saturation in this equalizer stage mode! 732 has a big phono overload capacity of 320 mV all 1 KHz and 1500 mV at 10 KHz. The phono overload capacity gets larger with the rise, in frequency so that it is the same as that of the RIAA equalization curve. RIAA deflection is ± 0.5 dB from 30 to 15.000 Hz. The signal to noise (S/N) ratio is better than 75 dB.
Tone Control
The tone control knob of model 732 has click stops and each stop is equivalent to 2 dB up or down. Frequency shift switches are provided for changing the turnover frequency of the tone control. This means that the turnover frequency for the bass is changeable to 400 Hz and 125 Hz and that of the treble 2.5 KHz and 8 KHz There is also an an/off switch or the tone control. High grade components have been used so there is precise response, and high stability
MC Amplifier
It is possible to connect an MC (Moving Coil) Cartridge directly to model 732. The advantage of a Moving Coil Cartridge is that it can reproduce the delicate and clear tones of an, kind of music. However, this excellence is lost it, a poor transformer or head amplifier is used. In model 732 5 transistors are used in the MC Amplifier to assure excellent Performance and to guarantee an above standard dynamic range, 13 mV at 1 KHz and 60 mV at 10 KHz (RMS). Model 732 also boasts of a good Signal to Noise ratio and low distortion.
Independent Mic. Amplifier
An Independent Mic. Amplifier is installed in Modem 732. Connect the mic. to the PHONO-2 terminal, turn the PHONO-2 selector to `'Mic" and the mic, is ready for use.
Transient Killer
Model 732 has been supplied with the Transient Killer to do away with noise to the ears and damage to the speakers that can take place when an ordinary amplifier is switched an or off. With this model there will be no harsh sounds grating an your nerves every time you turn it on.
Power amplifier Section
An unbelievable amount of effort has been expended, in an endeavor to reduce distortion of any kind in the amplifier section of model 732. For this purpose model 732 has pure complementary SEPP. direct coupled and differential amplifier circuitry. The power amplifier circuitry was analysed by a computer but this analysis was not restricted to the audible range. it was extended beyond that range because live music contains many signals in this inaudible range. Onkyo found that the very low frequencies have a very important bearing an the music even though they cannot be heard. Ordinary amplifiers that do not take these very low frequencies into consideration, cause a lot of distortion because this disturbance in the very low frequencies causes IM distortion throughout the whole range of the signal. The statistics for his amplifier are very impressive. It is capable of delivering a continuous power output o f 56 watts per channel at 8 ohms. The distortion of model 732 is rated a less than 0.02% at 10 Watts. 1 KHz. The same low rate of distortion is maintained regardless of whether model 732 is used at full power or played very softly.
The use of a differential amplifier means that this model is extremely stable. Instability in an amplifier will put DC voltage an the loudspeaker terminals and this will lead to distortion. Fluctuations in the power supply These voltage and temperature can also cause distortion but these fluctuations are solved by the differential amplifier, The OCL circuitry is an added reason this model has less distortion, a flatter response over the whole frequency range and especially good damping in the lower frequency range.
Protection Circuit
Model 732 has a protection circuit installed to guard the power transistors. This circuit detects the ASO (Area of Safe Operation) of the transistors and the heat that is produced when the power transistors surpass the limit that is allowed by the ASO. Difficulties arise because low impedance speakers are used and because sometimes the heat sink does not dissipate enough of the heat. The protection circuit of model 732 Works perfectly and saves the power transistors.
Top Panel Connectors and Large Heat Sink
Connectors. which are usually located in the back of an amplifier, are centralized an the top panel of model 732 This construction makes the connection of various leads very easy even when the amplifier is placed against a wall. The rear Panel of the model is used as a large Heat Sink which helps to protect the power transistors as well as the rest of the amplifier. Thanks to the large Heat Sink in model 732 it always stays cool no matter how long it is used at full power.
Multi step-up Terminals
Model 732 has been designed in such a way that its preamplifier and main amplifier can be used separately. This design makes it much more versatile Because of this versatility model 732 can easily be the base of a multi-amplifier stereo System with the simple addition of either model 624 or 613.
These units are dividing amplifiers and their purpose is to separate and amplify the signals before they are passed an to the tweeter, mid-range speaker and f you add only one extra unit you will have a bi-amplifier system. lf two units are used you can up-grade you system to a tri-amplifier system.

All Silikon Transistors Intergraded Stereo Pre-Main Amplifier
Direct-Coupling and Differential Amplifier, Pure-Complementary
SEPP System, Transistors 54, Diode 20, Thermistor 2 and Posistor 4.
Main Amplifier (8 Ohm load in case of no indication)
Dynamic Power
150W (IHF 8 Ohm)
200W (IHF 4 Ohm)
RMS Continuous Power (Both Channel Driven)
56W+56W (8 Ohm1KHz)
68W+68W (4 Ohm1KHz)
Total Harmonic Distortion
lese than 0.1% (at rated output 1 kHz)
less than 0.03% (at 0.5W output 1 kHz)
less than 0.03% (at 10W output 1KHz)
Inter Modulation Distortion
less than 0,5% (at 34W output)
(SMPTE 70Hz :7KHz =4:1)
Frequency Characteristic
10Hz-80kHz ( +0 -1 dB at normal output)
Power Band Width
10Hz-100KHz (IHF -3 dB THD 0,2%)
S/N better than 110 dB, IHF A Network Shunt)
Damping Factor 100 (DC 20 kHz)
Load Impedance 4-16 Ohm
Input Impedance 100 kOhm (10 Hz.-50KHz)
Gain 27 dB
Rated Input Voltage 1V
Input/Output Characteristics in-phase
Output Terminal SPEAKER A, B. C, A +B, Headphone
Input Sensitivity and Input Impedance
PHONO-1(1.03KHz) 2.0mV (50KOhm, 30KOhm)
PHONO-2 MM 2.0 mV 50 KOhm)
MC 83µV (80 Ohm)
MIC 1.SmV (50KS2)
TUNER. AUX-1. AUX-2. PLAY l00mV (100Kohm)
Total Harmonic Distortion less than 0.05 % (at 1V output 1KHz)
Inter Modulation Distortion
Iess than 0.05 %(at 1V output 1KHz)
(SMPTE 70Hz : 7KHz=4:1)
Frequency Characteristics
PHONO-1. PHONO-2 30Hz-15KHz ( ± 0,5dB)
TUNER. AUX-1. AUX-2. PLAY 10Hz-70KHz ( +0 -1 dB)
Max. Allowable Input (Phono)
MM320mV (kHz).1500mV (10KHz) RMS
MC 13mV (1KHz).60mV (10KHz) RMS
S/N (IHF A Network Input Shunt)
PHONO-1better than 75dB
PHONO-2 MM better than 75dB
MC better than 55 dB
MICbetter than 69 dB
TUNER. AUX-1 AUX-Play better than 90dB
Output Voltage and Output Impedance ...
PREOUT-1. PREOUT-2 (100KOhm at load)
1V (Rated Output)
4V (Max. Output)
Output Impedance 2.2KOhm
PRE-OUT (Open Voltage) 100mV (Rated Output)
Output Impedance (PHONO) 10Kohm
Tone Control 2dB/Step Switch Type ...
TREBLE ± 10dB at 10KHz,30KHz
BASS ± 10dB at 100Hz, 30Hz
BASS 400Hz, 125Hz
HIGH Filter (-3dB) 7KHz 12dB/oct
LOW Filter (-3dB) 70Hz 12dB/oct
Muting -20dB
Loudness VR. -30dB, -6dB (100Hz)
Input/Output Polarity
MC-Amp anti-phase
EQ-Amp (MIC) in-phase
TONE-Amp anti-phase
Transient Killer Operation Time
when SW is turned on. 3 sec.
when SW is turned off. 0.5 sec.
Power AC 100, 110. 120.220.240V.50/60Hz
Power Consumption Electrical Goods, Control Standards 80W
Dimensions37(W) x 355(D) x 136(H)mrn
17.5"(W) x 14"(D! x 5.4"(H)
Weight 12.5kg, 27.5 Ib.



Das Archiv freut sich über jeden HiFi- Prospekt von euch, den ihr entbehren könnt, der es immer unergründlicher & unheimlicher wachsen lässt.
#6 erstellt: 10. Mrz 2006, 03:49
Hallo Hannes,
die 700er Reihe gab es seit 1972 in Deutschland, damals auch Test in HIFI-Sterophonie. Zu den Verstärkern gab es noch den Tuner T433.
Seit 1973 habe ich den 725 (das kleinste Modell)in Betrieb, ich suche zur Zeit noch die Originalunterlagen in meinem Papierwust.
Die Verstärker waren für aktive Mehrwegewiedergabe gedacht, an die DIN-Buchse kommt die aktive Frequenzweiche, das Basssignal geht in den Verstärker zurück, in die aktive Frequenzweiche war eine Endstufe integriert. Für 3-Wege-Wiedergabe brauchte man also 2 dieser Frequenzweichen. Die damaligen Onkyo-Lautsprecher waren dafür vorbereitet.

Sobald ich die Unterlagen gefunden habe, melde ich mich, um Dir eine Kopie zukommen zu lassen, denn der Aufbau und die Ausstattung waren weitgehend identisch.

Mit besten Gruß
Schaut ab und zu mal vorbei
#7 erstellt: 11. Mrz 2006, 11:13
Herzlichen Dank für die Antworten, ich habe ihn mittlerweile mal ausgiebig getestet und er funktioniert einwandfrei, bin sehr zufrieden.
Allerdings schon seltsam im World Wide Web so wenig über dieses Model zu finden.
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