Marantz - 4140 - Stereo - Quadraphonic Solid state amplifier
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Selected by Ariel Cabello
Holds dual bachelor's degrees in electronics and physics with 20 years in audio engineering.
Estimate € 1,800 - € 2,000
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Marantz 4140 stereo quadraphonic integrated amplifier, year 1975, in excellent physical condition and fully tested working, weight 17 kg, dimensions 16 x 39 x 42 cm, no extras.
AI-assisted summary
Description from the seller
Very rare for sale: integrated Marantz 4140 Quad.
It is a true collectible item that has been fully restored.
New!
The rectifier diodes U11C and U12C were replaced with modern ultra-fast diodes, each equipped with a snubber capacitor, to achieve a perfect power supply!
For sale: an exceptional Marantz 4140 integrated amplifier, a true legend from the "Silver Face" era.
Sold with its rare SQ decoder Marantz SQA1!
This device has undergone a complete restoration aimed at surpassing its original performance while ensuring reliability for the next 30 years and preserving Marantz's distinctive sound signature.
This is not a simple repair, but a complete audiophile refurbishment.
Technical details of the restoration (The components)
1. Capacitors (Total Recapping): All electrolytic capacitors have been replaced. The choice of brands is geared towards performance and musicality:
Power Supply: Major upgrade with 22,000µF Nippon Chemi-Con capacitors (huge capacity for exceptional dynamics and bass control).
Audio Circuit (Signal Path): Nichicon MUSE, FG (Fine Gold) and FW audiophile capacitors, renowned for their transparency and harmonic richness.
Power Supply and Decoupling: Panasonic FM and FC capacitors with very low impedance and long life.
Connections: WIMA film capacitors for surgical precision in high frequencies.
2. Transistors (Reliability and Low Noise): Obsessive attention has been paid to transistors to guarantee absolutely silent operation:
Noise reduction: Replacement of the transistors notorious for their noise and oxidation of their pins (2SC458, 2SA640, 2SC733) with modern, very low-noise equivalents Onsemi KSC1845 & KSA992.
Safety & Stability: Unstable transistors (2SC1451) and aging standards (2SC945) on the power boards have been proactively replaced with robust Onsemi models (KSC2690/KSC2383).
Replacing the relay with a modern, low-noise relay
Input stage: Differential pairs replaced by matched pairs transistors for perfect DC Offset (0V) stability.
3. Calibration & Maintenance:
Cleaning of potentiometers, switches and contacts (DeOxit).
Complete adjustment of Bias and DC Offset to factory specifications.
Aesthetic & Functional Condition
The amplifier is in superb overall condition. The brushed aluminum front panel is very clean and the iconic blue lighting is fully functional. Plug & Play.
A shipment is of course possible everywhere in Europe!
Just ask me.
I usually send packages, I make super sturdy parcels!
Will be sent with insurance.
Very rare for sale: integrated Marantz 4140 Quad.
It is a true collectible item that has been fully restored.
New!
The rectifier diodes U11C and U12C were replaced with modern ultra-fast diodes, each equipped with a snubber capacitor, to achieve a perfect power supply!
For sale: an exceptional Marantz 4140 integrated amplifier, a true legend from the "Silver Face" era.
Sold with its rare SQ decoder Marantz SQA1!
This device has undergone a complete restoration aimed at surpassing its original performance while ensuring reliability for the next 30 years and preserving Marantz's distinctive sound signature.
This is not a simple repair, but a complete audiophile refurbishment.
Technical details of the restoration (The components)
1. Capacitors (Total Recapping): All electrolytic capacitors have been replaced. The choice of brands is geared towards performance and musicality:
Power Supply: Major upgrade with 22,000µF Nippon Chemi-Con capacitors (huge capacity for exceptional dynamics and bass control).
Audio Circuit (Signal Path): Nichicon MUSE, FG (Fine Gold) and FW audiophile capacitors, renowned for their transparency and harmonic richness.
Power Supply and Decoupling: Panasonic FM and FC capacitors with very low impedance and long life.
Connections: WIMA film capacitors for surgical precision in high frequencies.
2. Transistors (Reliability and Low Noise): Obsessive attention has been paid to transistors to guarantee absolutely silent operation:
Noise reduction: Replacement of the transistors notorious for their noise and oxidation of their pins (2SC458, 2SA640, 2SC733) with modern, very low-noise equivalents Onsemi KSC1845 & KSA992.
Safety & Stability: Unstable transistors (2SC1451) and aging standards (2SC945) on the power boards have been proactively replaced with robust Onsemi models (KSC2690/KSC2383).
Replacing the relay with a modern, low-noise relay
Input stage: Differential pairs replaced by matched pairs transistors for perfect DC Offset (0V) stability.
3. Calibration & Maintenance:
Cleaning of potentiometers, switches and contacts (DeOxit).
Complete adjustment of Bias and DC Offset to factory specifications.
Aesthetic & Functional Condition
The amplifier is in superb overall condition. The brushed aluminum front panel is very clean and the iconic blue lighting is fully functional. Plug & Play.
A shipment is of course possible everywhere in Europe!
Just ask me.
I usually send packages, I make super sturdy parcels!
Will be sent with insurance.
Details
Era
1900-2000
Brand
Marantz
Model
4140 - Stereo - Quadraphonic
Multiple Models
No
Physical condition
Excellent
Nr of items
1
Includes
No extra's
Year of Manufacturing
1975
Weight
17 kg
Functional condition
Tested and working/playable
Height
16 cm
Width
39 cm
Depth
42 cm
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