Pioneer CT-720
¥ 79,800 (released in 1979)
Commentary
A stereo cassette deck developed based on the design philosophy of the CT 920.
The recording and reproducing heads are made of Sendust alloy, which has excellent distortion factor characteristics and high-frequency characteristics at high input, ensuring a wide range and an S / N ratio of 69 dB. In addition, the combination type prevents characteristic degradation due to azimuth deviation.
In addition, a special alloy erasing head for small windows with high erasing performance is adopted for the erasing head, and it can handle metal tapes with high holding power.
The mechanism uses a closed-loop dual capstan system to keep the head touch always in good condition and to suppress the fluctuation of the tape tension and the generation of modulation noise.
In addition, an electronically controlled DC motor with a built-in generator (for constant speed) and a DC high-torque motor (for fast forward) are used in the drive part to reduce uneven rotation and obtain excellent durability.
Equipped with an ATLC mechanism that removes tape slack when the cassette half is mounted.
Wide range 2 color FL level meter of -20 to + 8 dB is adopted, and it corresponds to the peak component of music which changes rapidly.
The response instruction is a two step switching type of average and peak.
Uses a soft push type direct change operation button.
In addition, since it can be preset, you can record the absence by combining with a timer sold separately.
Using a monitor switch, recording status can be checked in real time.
Equipped with a bias adjustment mechanism.
Equipped with a Dolby system.
Model Rating
| Type | Cassette deck | ||
| Heads | Recording : Sendust head Playing : Sendust head Erasing : special alloy heads |
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| Motor | For constant speed drive : Electronically controlled DC motor (built-in generator) For Reel Drive : DC High Torque Motor |
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| Quick winding speed | 85 seconds or less (at C-60) | ||
| Uneven rotation | 0.04% or less (WRMS) | ||
| Frequency characteristic |
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| Signal-to-noise ratio | Dolby OFF : 59 dB or more Dolby ON : 69 dB or more (5 kHz or more) (3rd harmonic distortion rate 3%, audibility correction) |
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| Distortion factor | 1.2% or less (0 dB) | ||
| Operating part | Solenoid driven, feather-touch direct change Voice recording function using timer |
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| Input Sensitivity / Maximum Allowable Input / Impedance |
Mic : 0.3mV/100mV/10k Ω, 6 mm φ Jack (Applicable Microphone Impedance : 250 Ω ~ 10k Ω) Line : 64mV/25V/85k Ω, Pin Jack |
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| Output Reference Level / Maximum Level / Load impedance |
Line : 450mV/630mV/50k Ω, Pin Jack Headset : 70mV/98mV/8 Ω, 8 mm φ Stereo Jack |
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| Accessory function | Dolby System (with LED display) 2-Color FL Display Type Level Meter (-20 to + 8 dB, with Average Selector Switch) Volume for bias fine adjustment Tape Selector (METAL, CrO2, Fe-Cr, STD) Automatic Tape Slack Removal / ATLC Mic plug interlock input switching (Mic plug priority MIC/LINE switching) Cassette back illumination mechanism Timer standby mechanism |
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| Semiconductor used | IC : 10 Transistor : 52 Pieces (For Motor Control : 3 Pieces) Diode : 42 Pieces (For Motor Control : 1 Piece) Zener diode : 3 pcs LED : 7 |
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| Pwer | 100 VAC, 50Hz/60Hz | ||
| Power consumption | 45W | ||
| External dimensions | Width 420x Height 150x Depth 361 mm | ||
| Weight | 9.2kg |