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Used – Serviced and fully functional.
Unit has been thoroughly cleaned, inspected, serviced, adjusted, and tested. All controls and functions operate properly. Cosmetic wear consistent with age is present, including light scratches on the top/bottom covers and a slight bend at the lower corner of the faceplate, which is not very noticeable. Please review all photos and video carefully.
Both Manuals are included: Operating instructions and Service Manual
Description
Vintage Pioneer SR-303 Stereo Reverberation Amplifier – Serviced, Adjusted & Tested
Offered here is a Pioneer SR-303 stereo reverberation amplifier in excellent working condition.
The SR-303 is an all-electronic reverberation processor using a BBD (Bucket Brigade Device) analog delay system, rather than the mechanical spring-type reverb used in many earlier units. It offers adjustable reverberation depth and delay time, plus two effect modes, making it a great addition to a vintage stereo system or audio setup. Pioneer specified a frequency response of 5Hz–70kHz, less than 0.05% THD, a 90 dB S/N ratio, and reverberation times up to approximately 3 seconds depending on mode.
Service performed includes:
- Thorough exterior cleaning of the faceplate, top, bottom, and rear panels
- Switches, selectors and potentiometers cleaned and treated with DeoxIT
- RCA input and output connectors cleaned with appropriate contact-cleaning brushes
- Power-supply electrolytic capacitors individually inspected
- Six electrolytic capacitors in the power-supply section replaced for longevity
- Audio-path electrolytic capacitors checked in circuit and found to test properly
- Cold or questionable solder joints inspected and reflowed where needed
- 20 kHz reference adjusted at TP1
- VR3 adjustment performed according to the Pioneer service procedure using a 400 Hz / 150 mV test signal and monitoring TP2 for proper waveform symmetry
- Final operational testing completed
- 24-hour burn-in test successfully completed
All front-panel controls, effect functions, and indicators operate properly.
The unit performs very well, and the listing video clearly demonstrates the reverb effect. The video shows the actual unit for sale operating and demonstrates the audible effect of the reverberation circuitry.
Specifications:
- Model: Pioneer SR-303
- Type: Stereo Reverberation Amplifier
- Reverb system: Electronic BBD analog delay
- Input sensitivity: 150 mV
- Frequency response: 5 Hz–70 kHz
- THD: Less than 0.05%
- Signal-to-noise ratio: 90 dB
- Reverberation time: Up to approximately 3 seconds depending on effect mode
- Output level: 150 mV
- Dimensions: Approx. 16.5" W × 3.9" H × 13.2" D
- Weight: Approx. 9.5 lb
- Vintage: Early 1980s
Included:
- Pioneer SR-303 Reverberation Amplifier only
- No additional cables, manuals, or accessories unless specifically shown in the photos
This is a vintage electronic component and should be connected only to compatible line-level equipment. Buyer is responsible for verifying compatibility with their system.
Return Policy / Warranty
This item is sold as described and shown in the photos and video. Please review all photos carefully, as they are part of the description.
The unit has been serviced, tested, and successfully burn-tested prior to listing.
We accept returns only if the item is returned in the same condition it was received. Units that have been opened, modified, altered, damaged, or serviced after delivery are not eligible for the seller’s voluntary return policy.
Please contact us with any questions before purchasing.
Thank you for looking, and Happy ing!
