Technics SU-300MC
¥ 10,000 (around 1977)
Commentary
MC pre-preamp for enjoying MC cartridge.
An ultra-low noise transistor M47LP is used in the first stage to achieve an input conversion level of -150dBV.
Built-in muting circuit using relay that eliminates shock sound when switching switches.
Since this relay only operates for a few seconds when the switch is turned ON, the current consumed by the relay is almost 0 under normal conditions, preventing a reduction in battery life.
Equipped with an LED indicator linked to the power switch to let you know when the battery is out of life.
This indicator also serves as an indicator for turning the power on, and also serves as a warning for battery exhaustion caused by forgetting to turn off the power.
A gold-plated terminal with excellent humidity resistance and durability is used for the input power terminal.
Six single dry batteries are used for power supply, and induction hum from power transformer, etc. is eliminated.
In addition, over 120 hours of continuous use has been achieved.
Model Rating
| Type | MC pre-preamp |
| Voltage gain | MC:28dB MM:0dB |
| Input impedance | 47 Ω |
| Input equivalent noise level | -150dBV |
| Signal-to-noise ratio (IHF-A) | 250 μ V input : 78 dB At 100 μ V input : 70 dB |
| Frequency characteristic | 20 Hz ~ 20 kHz + 0 -0.5 dB 8 Hz ~ 300 kHz + 0 -3dB |
| Total harmonic distortion factor | 0.01% (in combination with SU-9070II) |
| Pwer | 6 x SUM-1-D (single dry battery) |
| Power consumption | 450mW |
| External dimensions | Width 140x Height 55x Depth 265 mm |
| Weight | 1.1 kg (Excluding Dry Batteries) |