Technics RS-7500U
¥ 128,000 (around 1976)
Commentary
This is an L-cassette deck that can record and replay L-cassettes.
The head part uses a 3-head system with independent recording and rerecording, and tape monitoring is possible.
In addition, the newly developed high-hardness permalloy is used for both recording and reproducing heads to realize low-distortion and wide-band recording and reproduction.
The motor is a FG-servo DC motor that boasts excellent running performance.
In addition, an independent drive mechanism has been adopted to take advantage of the FG servo motor, achieving 0.06% wow / flutter and 0.5% speed drift.
A constant voltage power supply composed of six transistors is used for the power supply.
Low-noise transistors, FETs, and high-precision metal film capacitors are used in the amplifier section to achieve a high SN ratio.
For mixing the output from the microphone amplifier and the line input, an operation amplifier with a large input impedance using an FET is used, so that each level can be adjusted freely and loss due to mixing is reduced.
Equipped with an electronic muting circuit to prevent clicking sound at the time of power ON/OFF or recording start.
It automatically switches the bias and equalizer for Type I, II, and III tapes, and an indicator shows the type of tape being used on the front panel.
A torque limiter mechanism is mounted on the reel unit to prevent tape damage during early winding.
It also uses a photoelectric full auto-stop mechanism to prevent the tape from being damaged.
It uses an automatic tape loading system.
It uses a mechanism that winds the tape into the cassette shell when it is ejected and releases it.
Equipped with timer recording and re-mechanism.
Equipped with a memory rewind mechanism.
Equipped with a large level meter.
The volume uses an L/R2-axis double friction drive type volume for improved usability.
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Model Rating
| Type | El Cassette Deck |
| Head configuration | For Recording : High Hardness Permalloy For Regeneration : High Hardness Permalloy x2 For Erase : Ferrite |
| Motor used | FG servo DC motor |
| Frequency characteristic | Tyep II/III : 25 Hz to 22 kHz ± 3 dB |
| Signal-to-noise ratio | Type I:60dB Type II/III:63dB |
| Wow flutter | 0.06%(WRMS) |
| Input Sensitivity / Impedance | Mic : 0.25 mV (-72dB) / 400 Ω ~ 20k Ω Line in:60mV(-24dB) |
| Output Level / Impedance | Line out : 580mV/22k Ω or more Headphone : 60mV/8 Ω |
| Semiconductor used | Transistor : 69 pcs Diode : 31 Units Other semiconductors : 9 pcs |
| Pwer | 100 VAC, 50Hz/60Hz |
| Power consumption | Approx. 20W |
| External dimensions | Width 450x Height 254x Depth 340 mm |
| Weight | Approximately 14 kg |