Sony ST-S730ES AM/FM Tuner

The ST-S703ES topped Sony's tuner line in 1988. It is a solidly built, excellent sounding unit with great ergononics. It includes a large, smoothly operating knob that can be used to tune stations manually or to jump between the 20 available presets. It also includes narrow/wide and stereo/mono/high-blend tuning modes for optimizing reception.

My Tuner

Here are some photos of my tuner. Click any photo to see a larger version.

Front Back Left Side Right Side

My tuner has simulated wood side panels. I have read that some units had real wood (or veneered) panels, but I don't know for sure.

This photo shows the only cosmetic flaw. The right front corner of the top cover has four small dimples/dents. I used a flash to highlight the dimples.

Dimples/Dents on Top

I bought my tuner used about three years ago. It did not include the AM loop antenna that came with the original, so you will need to purchase your own AM antenna if AM reception is important to you.

The unit I bought also did not include a manual, but you can order one from Sony. I actually did that, but I somehow managed to lose it. Here's a link to the order page: ST-S730ES Manual (English) at Sony Direct Accessories & Parts Center (DAPC). The manual costs $5.00 plus shipping (which I think was about $2.00 when I ordered mine).

Links to More Information

Sony Tuner Reviews at Tuner Information Center, a fantastic source of information about vintage tuners. (The page takes a while to load. The 730ES review is about two-thirds down the page.)

There are also several posts about this tuner at Yahoo's FM Tuners - High End FM Tuners discussion group. You will need to join the group in order to read and search for messages.

Finally, here's a link to a discussion about the ST-S730ES at Audio Asylum's Tuner forum. One of my responses describes how to store presets.


FM Tuner
Tuning range 87.5 - 108 MHz
Antenna terminals 75 ohms unbalanced
Intermediate frequency 10.7 MHz
Sensitivity at 50 dB quieting (mono) 16.8 dBf, 1.8 microvolts (mono)
37.9 dBf, 22.5 microvolts (stero)
Usable sensitivity 10.3 dBf, 0.9 microvolts (IHF)
Signal-to-noise ratio at 75 kHz deviation 96 db (mono)
92 dB (stereo)
Harmonic distortion WIDE: 0.004% (mono), 0.0075% (stereo)
NARROW: 0.04% (mono), ,0.07% (stereo)
IM distortion WIDE: 0.004% (mono), 0.0075% (stereo)
NARROW: 0.04% (mono), 0.07% (stereo)
Separation at 1 kHz WIDE: 70 dB
Frequency response 15 Hz - 15 kHz +/- 0.2 dB
Selectivity NARROW: 65 dB at 300 kHz
WIDE: 70 dB at 400 kHz
Capture ratio WIDE: 1.0 dB
AM suppression ratio 65 dB
Image response ratio 100 dB
IF response ratio > 120 dB
Spurious response ratio > 120 dB
RF intermodulation 83 dB (800 kHz)
93 dB (2.4 MHz)
Subcarrier product ratio 45 dB (MPX filter off)
75 dB (MPX filter on)
Muting threshold Approximately 29 dBf, 8 microvolts
Auto tuning threshold 29 dBf
Output at 75 kHz deviation 750 mV, 270 ohms

AM Tuner
Tuning range 530 - 1610 kHz (10 kHz step)
522 - 1611 kHz (9 kHz step)
Antenna External antenna terminal
Intermediate frequency 450 kHz
Usable sensitivity External antenna: 30 microvolts/meter (at 999 or 1000 kHz)
Signal-to-noise ratio 54 dB (50 mV/m)
Harmonic distortion 0.3% (at 50 mV/m, 400 Hz)
Selectivity NARROW: 65 dB at 9 kHz, 55 dB at 10 kHz
WIDE: 50 dB at 9 kHz, 70 dB at 10 kHz

Circuit system FM stereo, FM/AM super-heterodyne tuner
PLL quartz-locked digital synthesizer system
Power requirements 120 V, 60 Hz
Power consumption 19 watts
Dimensions Approx. 470 x 86 x 372 mm (w/h/d)
(18 x 3 1/2 x 14 1/4 inches)
including projecting parts and controls
Weight Approx. 5.2 kg (11 lb 8 oz)