The Pioneer SX-850 is one of the standout receivers from Pioneer’s classic 1970s SX series, combining substantial build quality, a beautiful silver face, analog tuning meters, warm dial illumination, and a real wood cabinet.

This example has been professionally serviced and extensively recapped by 617HiFi in Brookline, Massachusetts.

The work went well beyond a basic cleaning or “checked out” service and included extensive capacitor replacement, amplifier adjustment, control servicing, and repair of a damaged tape-monitor switch.

It is a strong choice for someone looking for a classic SX-850 that has already received meaningful professional attention while retaining original components where they continued to test properly.

🔧 Professional Service / Extensive Recap

Professional service included:

• Extensively recapped across the serviced electronic sections
• Main filter capacitors retained because they tested good
• Two power-supply capacitors retained because they tested good
• AM/FM tuner board remains original
• DC offset checked and set
• Amplifier bias checked and adjusted
• Potentiometers and switches cleaned and lubricated
• Previously broken tape-monitor switch disassembled and professionally rebuilt
• Receiver tested following service

I intentionally describe this receiver as “extensively recapped” rather than “fully recapped.” The main filter capacitors, two power-supply capacitors, and AM/FM board were retained rather than replaced.

I prefer to disclose exactly what was—and was not—replaced rather than overstate the restoration.

Internal photographs documenting the work are included in the listing.

✨ Detailed Cleaning

As part of the preparation process:

• Control knobs were removed
• Knobs were ultrasonically cleaned
• They were then hand-cleaned and finished before reinstallation
• Exterior surfaces and controls were carefully cleaned as part of the final preparation

Ultrasonic cleaning helps remove decades of accumulated residue from the detailed surfaces and grooves that are difficult to clean effectively by hand alone.

🎛️ Cosmetic Condition

This SX-850 is in very good vintage condition overall and presents very well for a receiver approaching 50 years old.

The brushed-aluminum faceplate is clean with strong lettering. The knobs, switches, tuning dial, meters, and controls present nicely, and the wood cabinet gives the receiver the classic Pioneer appearance these units are known for.

There are normal signs of age and prior use consistent with a vintage component of this era.

Please examine all photographs carefully, as the photos are part of the condition description.

This receiver is not represented as collector-mint or cosmetically perfect.

🎵 Why the Pioneer SX-850?

The SX-850 occupies a particularly desirable position in Pioneer’s classic receiver lineup.

With approximately 65 watts per channel, it delivers substantial real-world power while avoiding the enormous size and weight of some of Pioneer’s larger flagship receivers.

Features include:

• 65 watts per channel into 8Ω
• Dual phono inputs
• AUX input
• Dual tape facilities
• Tape monitor functions
• Pre-out / power-in connections
• A/B speaker outputs
• Bass and treble controls
• Tone turnover controls
• High and low filters
• Loudness control
• FM muting
• Analog signal-strength and tuning meters
• Large weighted tuning control
• Classic Pioneer illuminated dial
• Real wood cabinet

It works equally well as a daily listening receiver or as the centerpiece of a vintage audio system.

🛠️ Bash Vintage Audio

I specialize in carefully selected vintage audio equipment with an emphasis on:

• Professional servicing
• Accurate condition descriptions
• Transparent service history
• Careful testing
• Detailed cleaning
• Secure packing and shipping

I do not use terms such as “fully restored” or “fully recapped” unless the documented work actually supports those descriptions.

With vintage audio, transparency matters. Service work, retained original components, cosmetic imperfections, and other relevant information are disclosed so the buyer understands exactly what they are purchasing.

📸 Photos & Final Testing

The photographs show the actual Pioneer SX-850 being sold, including detailed exterior and internal photographs.

The receiver will be retested before packing and shipment.

Because this is vintage electronic equipment approximately five decades old, normal age-related characteristics should be expected.

Please review the photographs and description carefully before purchasing.

📦 Professional Packing & Insured Shipping

Heavy vintage receivers require careful packing.

The chassis, faceplate, tuning knob, switches, controls, meters, and wood cabinet will be carefully protected.

Packing will include:

• Substantial protective cushioning
• Protection around the faceplate and controls
• Strong outer packaging
• Additional reinforcement around vulnerable areas
• Double-boxing when appropriate
• Tracking provided

Shipment will use a Reverb shipping label with Reverb Safe Shipping / Reverb shipping protection.

Please retain all packing materials until you have fully inspected and tested the receiver after delivery.

↩️ Return Policy

Because this is a vintage electronic component approximately five decades old, please carefully review the listing description and all photographs prior to purchase.

Returns must be initiated and handled through Reverb in accordance with Reverb’s applicable return policies.

If a return is authorized:

• The receiver must be returned in the same condition in which it was received
• All original packing materials must be retained and reused
• The receiver must be repacked using the same protective method used for the original shipment
• Any included accessories or components must also be returned
• The receiver should not be opened, modified, repaired, or internally adjusted before contacting the seller about an issue
• Damage caused by improper repacking, misuse, modification, or operation after delivery may affect return eligibility

If the receiver arrives with shipping damage or a functional issue, please contact me promptly through Reverb before attempting any repair or modification so the condition can be documented and the issue handled through the appropriate Reverb process.

The receiver will be retested immediately before shipment to confirm operation prior to packing.

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