SONY TAE-8450
¥ 285,000 (around 1975)
Commentary
A high-end stereo preamplifier for faithful waveform transmission.
A unit amplifier capable of waveform transmission is used. An n-channel FET differential amplifier is used for the first stage, a PN transistor differential amplifier is used for the next stage, and a buffer amplifier is used for the last stage. All stages are directly connected to each other to form a DC amplifier.
The equalizer circuit is composed of two amplifiers, NF type for the low band and CR type for the high band.
It is equipped with a newly developed optical indication method peak program meter that follows up to the waveform of 1 ms and indicates.
Low-noise transistor is used for the head amplifier.
All of the headphone terminals are connected directly to each other by combining audio ICs and pure complimentary service outputs.
High-precision attenuator type level control is adopted.
The precision of each step is within ± 0.5 dB of the narrowing error and within ± 0.5 dB of the gang error.
It uses a 20 dB muting circuit in which the unit amplifier is bypassed.
CR type tone control with turnover frequency switching system is adopted.
It is equipped with a presence switch capable of correcting audibility.
It uses an active filter using FET that can switch the cutoff frequency between 10 Hz and 40 Hz for the low filter and between 9 kHz and 20 kHz for the high filter, realizing sharp cut-off characteristics and low distortion factor.
It uses a microphone mixing circuit that can also be used for business purposes. The microphone level and source / microphone balance can be adjusted simultaneously, and mixing is possible.
Two tape decks can be connected, allowing for dubbing during copy or source playback.
Equipped with an extra adapter terminal, 4-channel adapter, equalizer, tape deck, etc. can be connected.
Equipped with two phono inputs, the sensitivity can be switched between 1.5 mv and 4.5 mv, and the insertion of a head amplifier can be selected.
In addition to 50k Ω and 100k Ω, the input impedance can be freely selected from 10 Ω, 30 Ω, 100 Ω and 1k Ω when the head amplifier is inserted.
Model Rating
| Type | Stereo preamplifier | ||||
| Circuit system | Head amplifier : 3-stage direct connection circuit composed of 1-low-noise NPN and 2-PNP transistors Equalizer Amplifier : 2 unit amplifiers configuration Flat amplifier : log amplifier circuit with one dual FET and one PNP transistor configuration Tone control amplifier : One unit amplifier configuration Headphone amplifier : 1 IC pure complimentary service direct connection circuit Microphone amplifier : 1 IC pure complimentary service direct connection circuit
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| Amplifier Unit | |||||
| Input sensitivity / Impedance |
Phono1 : 1.5 mV, 4.5mV/50k Ω Phono2 : 1.5 mV, 4.5mV/50k Ω, 100k Ω When head amplifier is inserted : 0.16mV/10 Ω, 30 Ω, 100 Ω, 1k Ω MIC : 0.16mV/50k Ω Tuner, AUX1, 2, 3, Tape1, 2, EXT. Adapt : 150mV/50k Ω |
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| Output level / Impedance |
Rec Out1, 2 : 150 mv (Max. 10 v) / 1k Ω EXT. Adapt : 150 mv (Max. 14 v) / 10k Ω Headphone : 0.5V/8 ohm Output1, 2 : 1 V (Max. 14 V) / 1k Ω |
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| Harmonic distortion factor | 0.03% (1 kHz at rated output) | ||||
| Cross modulation distortion factor | 0.05% (at rated output) | ||||
| Frequency characteristic | Phono1 and 2 : RIAA deviation ± 0.2 dB MIC : 20 Hz ~ 20 kHz + 0 -3dB Tuner, AUX1, 2, 3, Tape1, 2, EXT. Adapt : 10 Hz to 100 kHz + 0 -1dB |
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| Tone control |
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| Filter | Low : 10Hz/40Hz, 12dB/oct. High : 9kHz/20kHz, 12dB/oct. |
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| Presence switch | 1 kHz, + 3.5 dB | ||||
| Residual noise | 70 μ V or Less (Volume Minimum, Tone Flat, Filter Off) | ||||
| Signal-to-noise ratio | Phono : 70 dB (A Network) MIC : 50 dB (B Network) Tuner, AUX, Tape, EXT. Adapt : 90 dB (A network) |
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| Meter Part | |||||
| Frequency characteristic | 30 Hz ~ 30 kHz + 0 -3dB | ||||
| Meter indication range | -50dB to + 5 dB (0 dB = 1 Vrms) -50dB to + 25 dB at Meter Sens Pull + 20 dB |
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| Minimum response pulse width | 1 ms (Peak mode) | ||||
| <General> | |||||
| Semiconductor used | Transistor : 83 IC : 2 FET : 51 Diode : 38 pcs |
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| Pwer | 100 VAC, 50Hz/60Hz | ||||
| Power outlet | Total 800W Power switch interlock : 2 systems Power switch not linked : 1 system |
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| Power consumption | 20W | ||||
| External dimensions | Width 440x Height 170x Depth 340 mm | ||||
| Weight | 11.8kg | ||||