Pioneer SX-780 Vintage Stereo Receiver – Restored – 1-Year Warranty

Professionally Restored by HQaudios – Backed by Our 1-Year Warranty.

Up for sale is the Pioneer SX-780, a classic late-1970s AM/FM stereo receiver combining
Pioneer’s distinctive silver-and-black front-panel styling, analog tuning display, dual power meters,
phono capability, tape connectivity, and a 45-watt-per-channel stereo amplifier.

The SX-780 occupies a particularly practical place in Pioneer’s vintage receiver lineup. Its rated output is
substantial enough for many bookshelf and floorstanding loudspeakers, while its compact proportions make it
easier to integrate into a home listening system than the company’s larger high-power receivers.

Visually, the receiver retains the design language that made late-1970s Pioneer components so recognizable:
brushed aluminum trim, illuminated analog tuning scale, twin power meters, a black control panel, large
aluminum knobs, and walnut-grained cabinet panels.

This specific unit has been professionally restored, serviced, inspected, and tested by HQaudios while
preserving the original engineering and vintage character of the Pioneer SX-780.

Key Highlights

• Authentic Pioneer SX-780 AM/FM Stereo Receiver
• 45 watts per channel into 8 ohms
• Rated from 20 Hz to 20 kHz at no more than 0.05% THD
• Built-in FM / AM tuner
• Dedicated phono input for turntable connection
• Two tape monitor loops
• Dual illuminated power output meters
• Speaker A / B selection
• Bass and treble controls with center-off tone-defeat operation
• Low filter, loudness, FM muting, stereo / mono mode, and balance controls
• Headphone output
• Walnut-grained cabinet panels with classic Pioneer styling
• Amplifier, tuner, controls, inputs, outputs, and speaker functions evaluated
• Professionally restored and serviced by HQaudios
• Carefully packed for safe shipping
• 1-Year HQaudios Warranty

Sound Character

The Pioneer SX-780 combines moderate output power with the lively, engaging presentation
associated with many Pioneer receivers from this period.

Its 45-watt-per-channel amplifier is well suited to a broad range of vintage loudspeakers, especially designs
with moderate to high sensitivity. Bass has useful weight and control for a receiver of this size, while the
midrange keeps vocals, guitars, piano, and acoustic instruments present and easy to follow.

The upper range remains open and energetic, making the SX-780 a natural match for classic rock, jazz, soul,
blues, acoustic recordings, and general vintage hi-fi listening. Bass, treble, loudness, and low-filter
controls provide additional flexibility for different rooms, speakers, and listening levels.

Cosmetic Condition

This Pioneer SX-780 presents in Very Good vintage cosmetic condition,
with normal signs of age and previous use consistent with a receiver from this era.

Please review all photos carefully, as they are part of the description.

• Faceplate / Front Panel: Clean overall presentation with the original Pioneer layout and lettering visible.
• Dial Glass / Tuning Display: Original analog tuning display remains clear and visually attractive.
• Power Meters: Both front-panel power meters are present with their original appearance.
• Knobs / Controls / Switches: Original control layout remains intact with normal vintage signs of use.
• Cabinet Panels: Walnut-grained cabinet surfaces show normal age-related wear consistent with previous ownership.
• Rear Panel / Connections: Original connection layout remains intact, including speaker terminals, antenna terminals, RCA connections, AC outlets, and factory identification label.

Minor surface marks, cabinet wear, or other cosmetic imperfections may remain. Please use the detailed
photographs as the final reference for the exact condition of this unit.

HQaudios Restoration & Testing Process

Amplifier, Tuner & Controls

45-Watt Stereo Amplifier

The SX-780 is factory rated at 45 watts per channel into 8 ohms from
20 Hz to 20 kHz with no more than 0.05% total harmonic distortion.
This output level makes it a practical match for many vintage bookshelf and floorstanding speakers.

AM / FM Analog Tuner

The receiver includes both FM and AM reception with a traditional analog tuning scale,
tuning meter, signal meter, stereo indicator, and FM muting control.

Independent Power Meters

Separate left and right power meters provide visual indication of amplifier output and form one of the
defining visual elements of the SX-780 front panel.

Tone, Filter & Listening Controls

The SX-780 provides bass, treble, balance, loudness, low-filter, mode, speaker-selection,
tape-monitor, and FM-muting controls. The bass and treble controls use center OFF positions that bypass
their tone-control networks for a flat response.

Specifications

What Is Included

1 × Pioneer SX-780 Stereo Receiver. No additional accessories are assumed unless clearly shown in the photos or specifically stated in the description.

Only the items clearly shown in the photos or specifically listed in the description are included.

Video Test & Sound Demo

We understand that purchasing a restored vintage receiver online requires confidence.

If you would like to see this Pioneer SX-780 in operation before purchasing,
please contact HQaudios directly. Whenever available, we can provide additional photos,
close-up images, operational videos, or sound demonstrations.

Demonstration may include tuner operation, meter movement, control operation,
speaker-output testing, and general music playback.

Suggested Pairing

The Pioneer SX-780 works best with speakers that offer reasonable sensitivity
and do not require unusually high amplifier power.

Always confirm speaker impedance and power requirements before connection.

Basic Use Guide

To help maintain the long-term performance of this vintage receiver:

• Use speakers with appropriate impedance.
• For Speaker A or Speaker B alone, use speakers rated 4 ohms or higher.
• When using Speaker A+B simultaneously, each speaker should be 8 ohms or higher.
• Verify speaker polarity before powering the system.
• Avoid shorting the speaker terminals.
• Maintain adequate ventilation above and around the receiver.
• Avoid sustained amplifier clipping.
• Reduce volume before switching sources or speaker outputs.
• Connect this specific unit only to AC 120V / 60Hz power.

Please contact HQaudios if you need assistance with speaker matching, turntable connection,
tuner setup, or general system configuration.

Trade-In Program

Do you have vintage audio equipment you’d like to trade in?

HQaudios welcomes selected trade-ins involving receivers, amplifiers, speakers,
turntables, cassette decks, reel-to-reel decks, and other classic audio components.

Send us photographs, model information, and a brief description of your equipment.
Our team can review the item and discuss available trade-in options.

Build Your Vintage System

The Pioneer SX-780 can serve as the center of a complete vintage audio system.

Pair it with a compatible turntable, cassette deck, reel-to-reel machine,
or efficient vintage speaker system available from HQaudios.

Save $100 when purchasing this receiver together with another qualifying
restored vintage audio component from HQaudios.

Please contact us before purchase so we can confirm availability and prepare a combined offer.

Shipping & Packaging

Vintage receivers contain delicate meters, controls, switches, circuit assemblies,
and cabinet surfaces that require careful protection during transportation.
This Pioneer SX-780 will be carefully packed by HQaudios for safe delivery.

• Front panel and controls carefully protected.
• Tuning knob, switches, and meter area protected.
• Cabinet surfaces protected.
• Heavy-duty cushioning and protective packing materials used.
• Reinforced outer packaging used.
• Tracking information provided after shipment.
• Signature may be required for delivery.

Local pickup may also be available by appointment.

1-Year HQaudios Warranty

This Pioneer SX-780 is backed by our
1-Year HQaudios Warranty, covering proper electronic and functional operation
under normal home use as applicable to the service performed by HQaudios.

If you experience an issue, please contact HQaudios first.
Our team will help evaluate the issue and work toward an appropriate solution.

The warranty does not cover misuse, incorrect speaker wiring, sustained amplifier clipping,
incompatible equipment, incorrect voltage, physical damage, unauthorized repair,
cosmetic wear, or operation outside the manufacturer’s intended specifications.

Customer Service

If you have questions after receiving your SX-780, HQaudios can assist with speaker matching,
speaker impedance, turntable setup, phono connection, tape-deck connection, FM / AM antenna setup,
Speaker A / B operation, tone-control settings, and general system configuration.

Our team is available to help you integrate the receiver correctly into your vintage audio system.

Important Note for Buyers

This specific Pioneer SX-780 operates on AC 120V / 60Hz, as confirmed from the
rear label of the actual unit.

The rear panel also specifies Speaker A or B: 4 ohms or more per speaker and
Speaker A+B: 8 ohms or more per speaker.

Proper ventilation, correct voltage, and appropriate speaker matching are important for reliable
vintage receiver operation. Please review all photographs carefully for the exact cosmetic condition
and rear-panel configuration before purchase.

HQaudios – Vintage Audio Restored with Care.
Professionally Restored • Carefully Packed • 1-Year Warranty