ARCAM DELTA120
¥ 220,000 (around 1991)
Commentary
A stereo power amplifier that can also be used as a monaural power amplifier in bridge mode.
It can be used as a monaural power amplifier in bridge mode by switching the switch on the rear panel.
It can also be used as a monaural mode by switching the other switch, which can be used to drive a bi-amplifier system.
The power supply is equipped with an independent toroidal transformer, capacitor and rectifier circuit for each of the left and right channels to eliminate interference between the channels.
A large output current with a peak value of ± 25A is obtained by using a large toroidal power transformer and a Low ESR capacitor. This makes it possible to drive the speaker accurately in the low frequency range and even drive the speaker with low impedance.
A high-speed electronic protection circuit is mounted as a protection circuit.
In the event of a problem, the output relay operates to cut off the speaker output. This mechanism is also backed up by the speaker fuse, which can protect the amplifier from almost any kind of malfunction.
Non-magnetic aluminum chassis is used for the chassis, eliminating the strain that occurs when magnetic materials such as steel are used.
In addition, the elasticity of aluminum realizes effective vibration absorption.
The whole case of the amplifier is used as a heat sink.
High-quality parts such as 1% metal film resistance and polypropylene condenser are used.
In addition, every manufacturing process is subject to thorough quality control, printed circuit boards are automatically tested and the results are recorded in a computer, and assembled products are continuously operated for at least 24 hours before final testing.
Model Rating
| Type | Power amplifier |
| Output (1 kHz, 0.5% THD) | 110W + 110W (8 Ω) 155W + 155W (4 Ω) 310W (8 ω, bridge mode) |
| Frequency characteristic | AC input terminal : 1 Hz to 90 kHz + 0 -3dB DC Input Terminal : DC ~ 90 kHz + 0 -3dB |
| Distortion | 0.01% or Less (8 Ω, 100W, 1 kHz) |
| Sensitivity (1kHz/8 Ω) | Stereo mode : 1.00V/100W Bridge mode : 0.90V/300W |
| Input impedance | Stereo mode : 25k Ω Monaural mode : 12k Ω Bridge ode : 10k Ω |
| Signal-to-noise ratio | 100 dB or More (CCIR) |
| Pwer | 100 VAC, 50Hz/60Hz |
| External dimensions | Width 430x Height 92x Depth 272 mm |
| Weight | 7.5kg |