TRIO KA-770
¥ 64,800 (released in 1983)
Commentary
Pre-main amplifier that uses DLD (dynamic linear drive) circuit.
A DLD circuit is used to provide high current supply capability even under low impedance loads and to draw out the performance of all types of speakers.
This improves the ability to supply instantaneous power and makes it possible to drive a speaker system that repeats complex movements.
Σ drive system is adopted.
In addition to the waveform transmission at the input terminal of the amplifier, the waveform change at the input terminal of the speaker is suppressed even if a connection cable of several meters is used.
The equalizer amplifier uses a high SN, low distortion circuit with an ICL high GmFET differential input and an operational amplifier.
In particular, the grounding section uses a wire rod with a cross-sectional area six times larger than that of the conventional wire rod, which consists of 26 straight 0.26 mm single wires twisted together.
Each stage is laid out along the signal flow. In the power amplifier, the B-class stage and the A-class stage are placed on separate boards. In addition, the equalizer stage and the main stage are shielded by a large radiator to prevent interference between each block.
In addition, the power transformer is shielded to prevent adverse effects on the circuit such as power flux.
.JPG)
Model Rating
| Type | DLD Integrated Amplifier |
| Rated output | 100W + 100W (20 Hz ~ 20 kHz, both channel operation, 8 Ω) |
| Total harmonic distortion rate (20 Hz to 20 kHz) | 0.005% (at rated output, at 1/2 rated output) |
| Intermodulation distortion factor (60 hz : 7 khz = 4 : 1) | 0.005% (8 Ω at rated output) |
| Frequency characteristic | 8 Hz ~ 150kHz-3dB (CD/AUX, Tuner, Tape → SP Out) |
| Phono RIAA deviation | 30 Hz to 20 kHz ± 0.3 dB |
| Output bandwidth | 8 Hz ~ 80 kHz (8 Ω at 0.02% Distortion Rate) |
| SN ratio (IHF-A at rated output) | Phono MM:69dB(2.5mV) Phono MC : 107 dB (250 μ V) CD/AUX, Tuner, Tape : 107 dB |
| Tone control | Bass (400 Hz) : 100 Hz ± 10 dB Treble (3 kHz) : 10 kHz ± 10 dB |
| Loudness control | 100 Hz, + 10 dB (Volume-30dB) |
| Damping factor | 1000 (SP-A, 100 Hz) |
| Input Sensitivity / Impedance | Phono MM : 2.5mV/47k Ω Phono MC : 0.2mV/100 Ω CD/AUX, Tuner, Tape Play : 150mV/47k Ω |
| Phono maximum allowable input | MM : 200 mv (1 kHz, 0.008% THD) MC : 15 mv (1 kHz, 0.008% THD) |
| Output level | 150mV |
| Output impedance | 330 Ω (Tape Rec Pin) |
| Pwer | 100 VAC, 50Hz/60Hz |
| Rated power consumption (Electrical Appliance and Material Control Law) | 240W |
| Power outlet | 2 Systems 100W (Power Switch Linked) |
| External dimensions | Width 420x Height 128x Depth 338 mm |
| Weight | 8.7kg |