Audio Database
SA-3
Commentary

A control amplifier developed as an economy model to inherit the vacuum tube pre-concept accumulated in SA-5.

It consists of two circuits, vacuum tube and solid state, and brings out the advantages of each circuit.
In addition, by devising a circuit that maintains and supplies a stable voltage using solid state technology, the extra burden on the vacuum tube is reduced and the life is extended.

The power supply unit is separated from the chassis body to eliminate bad effects such as hum.
The SA-3 power unit supplies approximately 50 joules as power source.

TBD-15 vacuum tubes have been tested for more than 100 hours and have excellent characteristics. These high-voltage tubes with excellent linearity are constructed with a cathode follower circuit to achieve stable characteristics and excellent sound quality.
In addition, the performance of the vacuum tube is brought out by complete bias adjustment.

Model Rating
Type Tube type control amplifier
Input impedance Phono : 47k Ω (100 ph)
Gain 52dB
Total harmonic distortion factor 0.18%
Output level 70 v (max)
Output impedance 3k Ω
RIAA deviation 40 Hz to 18 kHz ± 0.1 dB
Rise time 12 μ / sec
Output bandwidth 5 Hz ~ 27 kHz (50k Ω load)
Signal-to-noise ratio Phono:83dB
Vacuum tube used 6DJ8x3
External dimensions Width 483x Height 58x Depth 300 mm
Weight 8.1kg