SONY TC-4550SD
¥ 158,000 (around 1976)
Commentary
The portable cassette recorder "Cassette Denseke DD" pursues the limits of cassettes and focuses on live recording.
It consists of two motors : a variable reluctance type frequency servo motor with FG for the capstan and a DC motor for quick winding.
The anti-rolling effect of the sample-and-hold wide-band servo realizes stable driving even in mobile use.
An F & F head is used for the head, and the characteristics are improved by a direct coupling method in which a reproducing amplifier is directly connected.
Equipped with a 3-step switching tape selector with independent bias and equalizer.
Equipped with a microphone attenuator.
Equipped with a Sony Limiter switch that suppresses only unexpected excessive input.
Equipped with a Dolby NR system that improves the high-frequency dynamic range.
Equipped with an MPX filter that cuts the pilot signal of the FM stereo broadcast transmission.
Speed tuning up to ± 6% is possible during playback.
Equipped with a monitor speaker that can change the mode of ON/OFF and L/L + R/R.
It also has a master volume.
Uses a 3-power supply system that supports 3 types of batteries : AC power supply (using the included AC pack), dry batteries, and car batteries.
Equipped with a DC-DC converter that compensates for the high linearity of the amplifier section.
Equipped with a memory light that turns on for approximately 10 seconds.
Equipped with auto shut-off mechanism.
Comes with a shoulder belt.
There was a carrying case sold separately.
Model Rating
| Type | Portable cassette recorder |
| Heads | Erase : 1 Recording : 1 |
| Motor | For Capstan : Frequency Servo Motor with FG For Quick Winding : DC Motor |
| Signal-to-noise ratio | 61 dB (Dolby off, Peak Level, Duadcassette) |
| Frequency characteristic | 20 Hz ~ 20 kHz (Dual Cassette) |
| Wow and flutter | 0.065%wrms |
| Distortion factor | 1.2% (Du Ad Cassette) |
| Monitor output | 500mW(EIAJ) |
| Pwer | 100 VAC (Attached AC Pack Used) Dry battery 12 v (D 1x8) Car Battery (Optional DCC-130 Used) |
| Battery life | About 40 Hours (Eveready Alkali AM-1) Approximately 12 hours (Sony Super SUM-1S) |
| Power consumption | 7 VA (at AC) |
| External dimensions | Width 370x Height 110x Depth 240 mm |
| Weight | 5.2 kg (including dry batteries) |
| Attachment | Shoulder belt |
| Sold Separately | Carrying Case LC-4550 (¥ 6,000) |