DIATONE DA-U600
¥ 46,800 (around 1972)
Commentary
Solid state pre-main amplifier with all stages directly connected.
The power amplifier section uses a differential amplifier and an all-stage direct connection OCL circuit without coupling and condenser. This circuit reduces the distortion factor and expands the power band with compared with the output circuit using conventional condenser. The output circuit is not affected by the output condenser and prevents the deterioration of sound quality.
It uses an equalizer amplifier with a high allowable input, enabling playback with less distortion.
A 3-layer protection circuit is provided. In the event of an error, a protection circuit consisting of four transistor protection fuses, two speaker protection fuses, four transistors fuses, four transistors, and four diodes.
Two types of tapes can be played and dubbed without changing the connection.
Built-in microphone mixing circuit.
Model Rating
Type | Solid state pre-main amplifier |
Power Amplifier Unit | |
Maximum effective power (0.5% distortion) | 30W + 30W (8 Ω) |
Harmonic distortion factor | 0.07% or Less (20 Hz to 20 kHz) |
Frequency characteristic | 10 Hz to 50 kHz -0.2 dB |
Damping factor | 40 |
Input sensitivity | 1V |
Input impedance | 50k Ω or more |
Preamplifier Section | |
Frequency characteristic | Phono : 20 Hz to 20 kHz (RIAA) AUX, Tuner, Tape : 10 hz -3dB, 20 khz -0.2 db Mic:100Hz -3dB 10kHz -6dB |
Equalizer allowable input | 170 mv (1 khz, non-clip) |
Crosstalk | 55 dB or More (1 kHz) |
Signal-to-noise ratio | Phono : 65 dB or more AUX, Tuner, Tape : 85 dB or more |
Input sensitivity | Phono:2.5mV Mic:2mV AUX, Tuner, Tape : 150 mv |
Output level | Rec Out:150mV Pre Out:1V |
Tone control | Bass : 100 Hz, ± 10 dB Treble : 10 kHz, ± 10 dB |
Loudness control (at Volume-30dB) | 100 Hz : + 6 dB, 10 kHz : + 5 dB |
Low-cut filter | 70 Hz, -6dB |
High-cut filter | 9 kHz, -6dB |
<General> | |
Power supply voltage | 100 VAC, 50Hz/60Hz |
Power consumption | 60W |
External dimensions | Width 456x Height 144x Depth 355 mm |
Weight | 9.1kg |