Description
Key Features
- FM stereo and AM reception – Suitable for receiving conventional analogue radio broadcasts.
- Digital frequency display – Displays the tuned frequency electronically while retaining a traditional tuning knob and scale.
- Sony Program Sensor system – Allows up to five station positions on each band to be selected using adjustable markers on the tuning scale.
- PLL quartz-synthesised tuning circuitry – Provides electronically controlled tuning while retaining manual operation.
- Signal-strength indicator – Helps with aerial positioning and identifying stronger radio signals.
- FM stereo/mono switching – Allows mono reception when weak signals produce excessive stereo noise.
- Classic Sony construction – Substantial metal casework and full-width styling from the company’s late-1970s separates range.
Design Highlights
The ST-515 is particularly interesting because of its unusual approach to station selection.
Rather than using conventional electronic preset memories, Sony employed a mechanical marker system linked to electronic tuning circuitry. Once the station markers have been positioned, the Program Sensor function allows the user to select those stations by moving the tuning pointer to the appropriate marker.
This arrangement combines the familiar operation of an analogue tuner with some of the convenience of later preset-based models.
The digital frequency display was also relatively distinctive for its period, providing a more precise frequency indication than relying solely on an analogue tuning scale.
Technical Specifications
Sources: Sony ST-515 original operating instructions, service manual, Hi-Fi Database and Hifi-Wiki.
- Manufacturer: Sony
- Model: ST-515
- Type: FM/AM stereo tuner
- Manufactured: Approximately 1977–1979
- Country of manufacture: Japan
- Tuning: Electronic tuning with manual control
- Frequency display: Digital
- Station selection: Program Sensor system
- Station markers: Up to 5 FM and 5 AM positions
- FM frequency range: 87.5–108MHz
- AM frequency range: 530–1605kHz
- FM usable sensitivity: 1.9µV (IHF)
- FM signal-to-noise ratio: 75dB mono / 70dB stereo
- FM stereo separation: 45dB at 1kHz
- FM frequency response: 30Hz–15kHz
- FM distortion: 0.15% mono / 0.25% stereo at 1kHz
- Audio output: Stereo RCA, 450mV nominal
- FM aerial connections: 75Ω and 300Ω
- Power consumption: 24W (UK/European specification)
- Dimensions: 410 × 145 × 260mm
- Weight: Approximately 5.7kg
Vintage Tuner Note
The ST-515 receives conventional analogue FM and AM broadcasts. It does not support DAB, DAB+ or internet radio.
Reception quality depends on local coverage and the connected aerial. As with any vintage tuner, age-related considerations apply to switches, tuning components and display circuitry.
Why Buy From Us
With over 40 years of experience selling second-hand hi-fi, we understand the importance of properly checking and accurately describing vintage audio equipment.
Unlike buying through an unverified private eBay listing, we provide clear descriptions, secure packaging, a 3-month guarantee unless otherwise stated, and after-sales support by phone or email.
Summary
The Sony ST-515 is an interesting example of late-1970s tuner engineering, particularly appealing for its distinctive Program Sensor system, digital frequency display and classic Sony styling.
A worthwhile addition to a vintage Sony separates system or for anyone who enjoys traditional analogue radio.
This listing is for one Sony ST-515 stereo tuner.
Please feel free to get in touch with any questions prior to purchase.
