Audio Database

SAX-300
Commentary

AM/FM multi-stereo amplifier which is highly praised as a completed product of SAX series and became a best seller.
In order to dispel the stereotype that the integrated amplifier is inferior to the separate amplifier, it was developed as an "amplifier for enthusiasts" by adding a tuner to the pre-main amplifier.

The 3-pole output tube 6R-A8P. P. is adopted for the audio section for the first time as a comprehensive amplifier, and high output and low distortion are achieved.
We have also adopted large 30W-class output transformers for each channel without considering the cost.

Taking into consideration the reduction of distortion in the intermediate amplifier, an NF tone control with a cathode follower drive is employed. This makes it possible to achieve smooth characteristics from the low to high range without waviness at the mid-point of the volume.

The recording terminal uses a cathode-follower method instead of the plate method, which has high output impedance.

The head amplifier uses a silicon transistor (micro-SEP).
In addition, the second stage is DC ignited to eliminate hum and noise.

The FM multi-circuit uses a switching matrix method.

Accessories such as high and low filters, loudness control, headphone jack, tape monitor and DIN socket are incorporated.

An AM ferrite antenna is built into the AM part.

Model Rating
Type AM/FM multi-stereo amplifier
Pre-Main Amplifier Section
Rated Output (IHF) Music Power : 30W
Effective output : 14W/14W
Stereo effective output : 13W + 13W (simultaneous operation for both channels)
Total harmonic distortion factor 0.8% (Rated Output)
Power Band With (IHFM) 20 Hz ~ 20 kHz (Distortion Factor 0.8%)
Frequency characteristic AUX : 20 Hz to 20 kHz ± 1.5 dB (normal output)
Hum and noise (IHF, rated output) AUX:70dB
Tape:70dB
Channel separation Phono:50dB
AUX:50dB
Residual noise 2 mv (8 Ω Terminal)
Load impedance 8 Ω, 16 Ω
Damping factor 22
Input Sensitivity / Impedance (Effective Output, 1 kHz) Phono MAG : 2.6mV/100k Ω
Tape Head : 2.1mV/100k Ω
AUX : 260mV/3M Ω
Tape Mon Pin, Din : 260mV/125k Ω
Recorded output Rec Out (Pin) : 40 dB (100 times the Phono input)
Rec Out (Din) : 34 dB (50 times the Phono input)
Equalizer characteristics Phono MAG:RIAA
Tape HEAD:NAB
Tone control Bass : 50 Hz, ± 13 dB
Treble : 10 kHz, ± 12 dB
Loudness control 50 Hz + 1 dB, 10 kHz + 5 dB
Noise filter 10kHz -10dB
Accessory circuit Mode switch : Stereo ⇔ mono
Selector switch
Tape monitor
Headphone jack
DIN connector
Transistor head amplifier
FM Tuner Section
Receiving frequency 76 MHz to 90 MHz
Practical sensitivity 4 μ V (S/N 30 dB, 30% MOD)
Image ratio 35dB
Signal-to-noise ratio 50dB
Total harmonic distortion factor 0.6% (at input 60dB30% 84 mc)
Frequency characteristic 20 Hz to 15 kHz ± 2 dB
FM Multiplex Section
Channel separation 35dB
Frequency characteristic 50 Hz to 15 kHz ± 2 dB
Total harmonic distortion factor 1%
Accessory circuit Tuning meter
FM-AFC
Stereo indicator
<AM Tuner Section>
Receiving frequency 535 kHz to 1605 kHz
Sensitivity 20 μ V (S/N 20 dB, 30% MOD, 1 mc)
Selectivity 20 dB (± 10 kHz)
Accessory circuit Bar antenna
Tuning meter
<General>
Semiconductor used
Vacuum Tubes (18 pcs) 6AQ8 : 6 pcs
6BA6 : 3
6BE6 : 1
6EL8 : 1
12AX7 : 2
12AU7 : 1 Piece
6RA8 : 4
Transistor 2SC-402 : 2
Silicon diode SW-0. 5d : 4
SW-0. 5a : 1 Piece
Germanium Diode OA91 : 12
Burr Cap IS-352 : 1 Piece
Power supply voltage 100 VAC, 50Hz/60Hz
Power consumption 200VA
External dimensions Width 460x Height 150x Depth 328 mm
Weight 16.5kg