SANSUI CA-303
¥ 88,000 (around 1970)
Commentary
Tube type preamplifier.
The circuit structure is similar to that of Marantz #7, except that the last stage of the equalizer stage is 12AT7, and the low-frequency time constant of the equalizer stage is two stages.
The chassis structure incorporates a transistor-type channel divider for a 3-channel amplifier in the upper space of six vacuum tubes arranged in a row.
It has a test signal oscillation circuit and can generate test signals (100 Hz, 1 kHz, 10 kHz).
Equipped with low / high filter, muting switch, and crossover frequency variable channel filter.
Model Rating
| Type | Preamplifier |
| Output voltage | 2 v (rated) 10 v (max.) |
| Frequency band | 10 Hz to 50000 Hz |
| Input Sensitivity / Impedance | Phono1, 2 : 2.0mV/30k Ω 50k Ω 100k Ω switching type AUX : 200mV/250k Ω |
| Signal-to-noise ratio | 80dB |
| Total harmonic distortion factor | 0.1% (Rated Output) |
| Tone control | High Frequency : 20 kHz, + 12 dB ~ -8dB (in 2 dB steps) (variable frequency, 1800, 3400, 6000 Hz and defeat) Low Frequency : 20 Hz, + 12 dB to -8dB in 2 dB steps (variable frequency, 159, 340, 700 Hz and defeat) |
| Configuration | Vacuum Tube x6 Transistor x2 8 diodes |
| External dimensions | Width 435x Height 155x Depth 281 mm |
| Weight | 10kg |