Maintained! The 606 is thick and unimaginable from its compact exterior. The good sound unique to QUAD allows you to enjoy not only classical music, but also jazz vocals in a mild way. The high level of musicality that makes you enjoy the music with a pleasant tone stands out. Non-genuine legs are attached to the exterior, and the urethane coating on the exterior has deteriorated, faded white, and some paint has peeled off (Mizusaki Ryo)
Maintenance information: 2026.2.4 maintained (pin jack replacement, other power transformers → transformer mounting part dismantled rubber part replaced. (All checks on both power stages and drive stages)
Accessories: power cable, copy of instruction manual
Main specifications: output 140W+140W (8Ω) W321×H155 (including feet) ×D238mm 12kg
Maintained! A famous machine 44 with an easy-to-handle RCA terminal added to the rear terminal of the Quad control amplifier. The British QUAD's small preamp is a perfect balance between the freshness and richness of character. When paired with the same speakers made in England, you can enjoy a calm, high-quality sound. There are line scratches on the left side of the exterior, dull buttons, etc., and there is a feeling of use throughout (Kobayashi Hitoshi)
Maintenance Information: 2026.2.3 Maintained (IC OP AMP replacement in CD position board. Other checks) 2025.3.5 maintenance completed (power supply SW contact cleaning, correction, RCA terminal screw tightening correction, cleaning, caulking each SW, Vol cleaning (some chips remain) 2023.11.15 maintenance (VOL cleaning, C replacement in other mainboards, C etc. in each AMP, etc.) AC spark killer replacement in the power supply.)
Accessories: power cord, connection cord, instruction manual (copy)
Main specifications: 2 LINE inputs, 1 PHONO input, 1 phono sensitivity, 1m/3m/10mV switching, W321 x H103 x D203 mm, 4 kg
The price has been drastically reduced. 2026/1/28 sales price 798,000 yen One owner item, in good condition. Macintosh's high-end SACD player. The D/A converter at the heart is equipped with the latest model from ESS in the United States, and by operating at quad balance, precise and high-quality music playback is obtained, and a high-rigidity die-cast thin tray mechanism, traditional stainless steel chassis, etc., pursues further improvement in sound quality. The exterior is also in good condition with no conspicuous scratches (Oikawa Tetsuji)
Maintenance information: 2026.1.27 Operation confirmed
Accessories: remote control, instruction manual, power cable, original box
Main specifications: Digital output terminals: 1 coaxial/TOS optical, 1 digital input terminal: 1 coaxial system (24/96), 1 TOS optical system (24/192), USB (TypeA) 1 system (24/192 kHz/DSD5.6) compatible disc formats: CD/SACD/CDR/CD-RW/DVD-R W445 x H152 x D416mm 12.7 kg
Maintained! This is a compact, space-saving quad preamp 34. It has a supple and delicate expressive power that is not inferior to the 44, which is a higher-level model. The supple, uncharacteristic character goes well with vacuum tube power amplifiers. As for the exterior, there are rust spots and line scratches on the top plate. Serial Q030141 (Tamura Eiji)
Maintenance information: 2026.1.31 Maintained (internal check, coupling C, bypass C, etc. replaced. Through-hole pattern check. Operation check)
Accessories: power cable
Main specifications: PHONO (MM compatible) module switchable type W321 x H64 x D207 mm 3.2 kg
The price has been reduced! 2026/1/28 sales price 99,800 yen*Line exclusive model. A QUAD control amplifier with a modern design. It is characterized by its simple, straightforward, and bouncy texture, which brings out the thickness of the sound. By adopting a double triode 6111WA as the central control device, a high signal-to-noise ratio has been achieved with a simple configuration. The exterior is dull and has small scratches. Serial 241677 (Yonejima Satoshi)
Maintenance information: 2026.1.28 Operation confirmed
Accessories: power cord
Main specifications: Vacuum tube 6111WA x 1 (double triode) LINE input/RCA x 5 systems, TAPE input/output/RCA x 2 systems
System, W300 x H88 x D125 mm, weight 3.4 kg
Maintained including panel cleaning! Genuine Electri Hyundai Mackin stereo power amplifier. It delivers 400W of high power from a traditional blue and black face. You can enjoy an attractive sound with a delicate and high degree of transparency added to the plump and sticky low frequencies. The exterior is slightly dull, but generally in good condition (Tomoho Asaine)
Maintenance information: 2026.1.30 maintained (panel dismantling, blue acrylic plate, adhesive peeling, panel cleaning, power supply, board, FET deterioration replacement, each SW cleaning, LED cutless operation check)
Accessories: instruction manual power cord
Main specifications: Complete quad balance circuit output 400W+400W (stereo), 800W (mono parallel) wide range output autoformer input/RCA1 system, XLR1 system W445 x H240 x D508 mm 50 kg
Maintained! A classic British Quad stereo power amplifier. Small in size yet full torque. The sound, which is as deep as a tube amp, exudes an appeal that won't fade. You can see a feeling of use, such as appearance, dullness, small scratches, etc. Serial 15733 (Yamato Yuki)
Maintenance information: 2025.6.7 maintenance completed (dismantling check, constant voltage drive Tr/Rch power stage Tr co-exchange, DC cut C/gain setting C co-exchange, operation check, bias/medium point output adjustment)
Accessories: copy of the instruction manual, power cord, connection cord
Main specifications: 45W+45W W120×H159×D324mm 8.2 kg
The disposal price has been reduced. Member discounts are not applicable. 2026/1/22 sales price 118,000 yen Maintained! This is QUAD's first transistor preamp. The dark tone, with a sweet sense of humidity, is the British sound itself. The combination with the company's 303 power amplifier is also an attractive system. In addition to paint peeling on the exterior and VOL dial, dullness and a feeling of use can be seen. Serial 88838
Maintenance information: 2026.1.2 maintained (balance VOL replacement, other in-board coupling C, bypass C, AC spark killer replacement, SW, VOL cleaning)
Accessories: 2 pairs of input cables, 1 pair of output cables, power cable, instruction manual (copy)
Main specifications: Phono 1 system, 3 line systems, W260 x H92 x D165 mm, 3 kg
Maintained in March 2025! Input/output RCA specification! It has an elegant and glossy tone, and the output sensitivity can be selected from 3 levels. Combinations with 405 are common, but 606 etc. are also a good match. It has the natural texture of the acoustic sauce and the smooth tone that feels good against the skin. Serial Q026723 (Fujisawa Yukishi)
Maintenance information: 2025.3.4 maintained (each SW.VOL cleaning, in-board C deterioration replacement, RCA pin jack cleaning, caulking, screwing, through-hole solder treatment, power switch internal contact correction, cleaning, operation check, spark killer deterioration replacement)
Accessories: copy of instruction manual, power cord
Main specifications: 2 LINE inputs, 1 PHONO input, 1 phono sensitivity, 1m/3m/10mV switching, W321 x H103 x D203 mm, 4 kg
Maintained! Late QUAD44 with CD input terminal. All inputs and outputs are equipped with RCA terminals. An elegant and lustrous tone. It has the natural texture of the acoustic sauce and the smooth tone that feels good against the skin. The output sensitivity can be selected from 3 levels. As for the exterior, there are scratches and dullness over time, and there is noticeable paint peeling on the right side. Serial Q036565 (Yamato Yuki)
Maintenance information: 2025.9.2 maintained (balance VOL cleaning, other SW and VOL checks, C etc. in each internal board replaced ~ operation check.) 2023.11.17 Maintained (filter VOL, SW lever installation failure, reprocessing, etc., internal bypass C, coupling C, etc. have been replaced, operation check OK)
Accessories: instruction manual copy power cable
Main specifications: LINE input 1 system PHONO input 1 system Phono sensitivity 1m/3m/10mV switching W321 × H103 × D203 mm 4.0 kg
Maintenance completed, including 18 capacitor replacements. *Balance VOL cannot be repaired, so it has been jumper treated and passed. Late QUAD44 with CD input terminal. All inputs and outputs are equipped with RCA terminals. An elegant and lustrous tone. It has the natural texture of the acoustic sauce and the smooth tone that feels good against the skin. The output sensitivity can be selected from 3 levels. You can see the exterior, dullness, and feeling of use (Kobayashi Hitoshi)
Maintenance information: 2025.3.27 maintenance completed (power SW contact cleaning, through hots re-solder, replacement pin jack cleaning, replacement pin jack cleaning, caulking, SW, VOL cleaning, balance VOL defects, and jumper processing: balance VOL cannot be used because repair is not possible)
Accessories: instruction manual, power cord
Main specifications: LINE input 1 system PHONO input 1 system Phono sensitivity 1m/3m/10mV switching W321 × H103 × D203 mm 4.0 kg
Maintained in April 2021! It comes with a variable gain VOL, making it easier to use. A classic British Quad stereo power amplifier. Small in size yet full torque. The sound, which is as deep as a tube amp, exudes an appeal that won't fade. You can see a feeling of use such as appearance, dullness, scratches, etc. (Kobayashi Hitoshi)
Maintenance information: 2026.1.10 operation confirmed 2021.4.30 maintenance completed (input/output panel replacement, RCA terminal volume installation, input/output waveform confirmation, left and right balance confirmation, comprehensive operation test)
Accessories: instruction manual, power cord, connection cord
Main specifications: 45W+45W W120×H159×D324mm 8.2 kg
Maintained! The output volume has been added to enable detailed gain control with QUAD33. A classic British Quad stereo power amplifier. Small in size yet full torque. The sound, which is as deep as a tube amp, exudes an appeal that won't fade. The exterior has a feeling of use over time, such as dullness and small scratches. Serial 51928 (Takasaki Atsushi)
Maintenance information: 2025.11.26 Maintained (block condenser liquid leak → replaced with a replacement product because the original is not available, Lch board liquid leak scattering pattern leak → cleaning, resistance burn replacement. (Other C, R, TR check status OK, operation check)
2024.3.22 Maintained (internal all checks, Tr, C, R co-operation check*INPUT modification available, AC code created for cable creation)
Accessories: power cord, instruction manual (copy)
Main specifications: 45W+45W W120×H159×D324mm 8.2 kg
The disposal price has been reduced. Member discounts are not applicable. 2026/1/11 sales price 128,000 yen Maintenance completed in 2013/1. Quad power amplifier Despite its compact body, you can enjoy a smooth, thick sound. It really goes well with speakers made in England, and makes you listen to 70s analog sound with a sense of dynamism. Exterior, dullness, chipping, bruises, abrasions, etc. can be seen (Kobayashi Hitoshi)
Maintenance information: 2026.1.10 operation confirmed 2013.1.18 maintenance completed (each inspection adjustment, RCA terminal installation, VR replacement input/output, balance waveform measurement operation confirmed)
Accessories: power cable, copy of instruction manual
Main specifications: 100W+100W frequency characteristics 20 to 20 kHz W341 x H115 x D195 mm 9 kg
The disposal price has been reduced. Member prices are not applicable. 2025/11/23 sales price 32,000 yen additional shelf board for QAVM. A valuable suriglass type that is now difficult to obtain. There are no noticeable scars (Kojima Yosuke)
Accessories: none
Main specifications: W1085×H25×D500mm
The disposal price has been reduced. Member prices are not applicable. 2025/11/23 sales price 32,000 yen additional shelf board for QAVM. A valuable suriglass type that is now difficult to obtain. There are no noticeable scars (Kojima Yosuke)
Accessories: none
Main specifications: W1085×H25×D500mm
The disposal price has been reduced (member prices are not applicable) 2025/12/20 sales price 118,000 yen Maintained! This is QUAD's first transistor preamp. The dark tone, with a sweet sense of humidity, is the British sound itself. The combination with the company's 303 power amplifier is also an attractive system. In addition to paint peeling on the exterior and VOL dial, dullness and a feeling of use can be seen. Serial 19243 (Yamato Yuki)
Maintenance information: 2025.1.19 maintained (all dismantling checks, internal PHONO/LINE board coupling C, replacement with audio grade C, bypass C, etc., power supply board C replacement, standard VOL cleaning)
Accessories: power cable connection cable
Main specifications: Phono 1 system, 3 line systems, W260 x H92 x D165 mm, 3 kg
The disposal price has been reduced (member prices are not applicable). 2025/11/16 Sales price 118,000 yen Maintenance has been completed, including replacement of 4 capacitors and 1 resistor. This is QUAD's first transistor preamp. The dark tone, with a sweet sense of humidity, is the British sound itself. The combination with the company's 303 power amplifier is also an attractive system. There are small scratches, dullness, etc. appropriate for the model year (Oikawa Tetsuji)
Maintenance Information: 2025.11.16 Maintained (AC Switch Spark Killer NG → Replaced. Replace the capacitor in the power supply. Capacitors in each AMP have been replaced. Each VOL and SW cleaning. Operation inspection check)
Accessories: power cable, connection cable, copy of instruction manual
Main specifications: Phono 1 system, 3 line systems, W260 x H92 x D165 mm, 3 kg
The disposal price has been reduced. Member prices are not applicable. 2025/12/11 sales price 128,000 yen The input terminal, 4 capacitors, 7 resistors have been replaced, etc. Maintenance has been completed. Quad power amplifier. Despite its compact body, you can enjoy a smooth, thick sound. It really goes well with speakers made in England, and makes you listen to 70s analog sound with a sense of dynamism. There are scratches on the top plate and sides, paint peeling, etc. (Oikawa Tetsuji)
Maintenance Information: 2025.12.11 Maintained (INPUT pin jack replaced
DIN connector without wiring → rewiring TN check in both channel boards OK gain setting C, DC cut C replacement, some resistors NG → replacement)
Accessories: power cable
Main specifications: 100W+100W frequency characteristics 20 to 20 kHz dimensions W341 x H115 x D195 mm weight 9 kg
The price has been drastically reduced. 2025/8/14 sales price 69,800 yen ※The remote control lid is out of stock, so it's cheap. Maintained in 2014. A preamplifier that can be operated by full remote control. A familiar quad tone that is natural, easy to listen to and won't get tired of. In addition to volume, left and right balance, input switching, etc., it is fully equipped with functions such as TILT (loudness like function), high pass, low pass filter (2 levels each), etc., making it convenient. The exterior has line scratches on the top plate and other scratches overall (Mizusaki Ryo)
Maintenance information: 2025.8.14 operation confirmed
2014.12.13 Maintained (disconnected due to AC fuse deterioration → replaced. Check internal capacitors, relays and transistors → OK. Since the remote control switch cannot be dismantled, it cannot be cleaned. Operation check OK)
Accessories: remote control, power cable
Main specifications: full remote control control amplifier with PHONO input (mm) W321 x H80 x D255 mm 3.3 kg
The disposal price has been reduced! (Member discounts are not applicable) 2025/11/19 sales price 128,000 yen Maintained! RCA and VOL have been added, so it's easy to use. The exterior is painted black. Quad power amplifier Despite its compact body, you can enjoy a smooth, thick sound. It really goes well with speakers made in England, and makes you listen to 70s analog sound with a sense of dynamism. The exterior is dull and has small scratches over time. Serial 8508 (Yonejima Satoshi)
Maintenance information: 2025.11.19 Maintained (internal all inspection → Lch power stage Tr, gain setting C, INPUT VOL replacement. DIN SP rewiring, first drive IC OP AMP replacement)
Accessories: power cord
Main specifications: 100W+100W frequency characteristics 20 to 20 kHz dimensions W341 x H115 x D195 mm weight 9 kg
The disposal price has been reduced! Member prices are not applicable. 2025/11/18 Sales price 128,000 yen Maintained! Quad power amplifier Although it is a compact body, you can enjoy the sound with a thick core. In particular, it makes me listen to 70s analog sounds with a sense of dynamism. There is dullness, scratches, and paint peeling (Asaine Tomoho)
Maintenance information: 2025.11.18 maintained (internal check pattern repair piece ch check) 2025.7.4 maintained (internal double channel dismantling TN check → OK. DC cut C, gain setting C, etc. exchange ~ operation check)
Accessories: power cable, connection cable
Main specifications: 100W+100W frequency characteristics 20 to 20 kHz dimensions W341 x H115 x D195 mm weight 9 kg
The disposal price has been reduced! (Member prices are not applicable) 2025/11/18 sales price 128,000 yen Maintained! The QUAD405 is full of appeal and makes you listen to the whole picture of the music in a tasteful way. Along with feedforward operation, the high quality, which smoothly transitions to A class operation at low levels and B class operation when the level rises, is also worth listening to. There are scratches, scuffs, and dullness on the exterior. Serial 4546 (Jun Tamai)
Maintenance information: 2025.10.12 Maintained (INPUT connector VOL lead resoldering process check)
2025.7.2 Maintained (internal all dismantling checks, Tr, C, R checks, operation checks, rubber, etc.)
2016.12.23 Maintained (Vol replacement, Rch power, Tr replacement, capacitor resistor replacement (both channels) operation check)
Accessories: Connection cord, power cord, copy of instruction manual
Main specifications: 100W+100W (8Ω) dimensions W341 x H115 x D195 mm weight 9 kg
The disposal price has been reduced. Member discounts are not applicable. 2025/8/31 sales price 128,000 yen 2023/10 maintenance completed. Quad power amplifier. Despite its compact body, you can enjoy a smooth, thick sound. It really goes well with speakers made in England, and makes you listen to 70s analog sound with a sense of dynamism. You can see a feeling of use, such as appearance, dullness, abrasions, etc. (Kobayashi Hitoshi)
Maintenance information: 2023.10.13 maintenance completed (internal parts dismantling check, power Tr, driver Tr, etc., etc. C, R, etc. can all be checked. Burn correction due to partial heat generation on both channel board patterns. The RCA terminal, input volume installation (expansion), Din terminal, SP terminal, and block capacitor have been replaced. (The input/output waveform was checked, left and right balance checked, load tests, and comprehensive operation tests were performed to confirm normal operation.)
Accessories: power cable, instruction manual (copy)
Main specifications: 100W+100W frequency characteristics 20 to 20 kHz dimensions W341 x H115 x D195 mm weight 9 kg
The disposal price has been reduced! (Member prices are not applicable) 2025/5/30 sales price 118,000 yen Maintained! This is QUAD's first transistor preamp. The luscious, shaded tone is British sound itself. If it's royal, I recommend combining it with the company's 303 power amplifier. There is a feeling of use over time (Daiki Goto)
Maintenance information: 2025.5.28 Maintained (power supply and PHONO/LINE board C all replaced. TONE/filter VOL replacement Other SW cleaning)
Accessories: copy of instruction manual, power cable, connection cable
Main specifications: Phono 1 system, 3 line systems, W260 x H92 x D165 mm, 3 kg
The disposal price has been reduced. Member discounts are not applicable. 2025/11/8 sales price 128,000 yen Maintained! Quad power amplifier Despite its compact body, you can enjoy a smooth, thick sound. It really goes well with speakers made in England, and makes you listen to 70s analog sound with a sense of dynamism. The exterior has a feeling of use such as dullness. Serial 57794 (Murakoshi Yoichi)
Maintenance information: 2025.11.7 Maintained (fuse replaced. Internal transistors, capacitors, resistance values, input/output waveforms, left and right balance checks, load tests, and comprehensive operation tests. Load test (1kHz sine wave, at 8Ω load: 100W+100W), sound output test. Running test 10H) 2018.5.24 maintenance completed (internal dismantling all checks, half-short leak replacement between power stages Tr x 1E-C, replacement of servo drop resistance defects in both other driver boards, operation check)
Accessories: power cord, instruction manual (copy)
Main specifications: 100W+100W frequency characteristics 20 to 20 kHz dimensions W341 x H115 x D195 mm weight 9 kg
The price has been reduced. 2025/6/7 sales price 24,000 yen, unopened, set of 4 It is said to be for quadra spike racks. These are high sound quality legs that can be used in place of genuine legs from compatible racks. Ideal sound quality can be brought out when combined with EcoBrass Spike-Base (ASB-0104/ASB-0103) (permanent future)
Maintenance information: 2025.6.7 operation confirmed
Accessories: none
Main specifications: Compatible models QUADRASPIRE racks (compatible with Q4/Q4D series and QAVM glass shelf models)
screw hole diameter 12mm
The disposal price has been reduced. Member discounts are not applicable. 2025/8/30 sales price 118,000 yen Maintained! This is QUAD's first transistor preamp. The dark tone, with a sweet sense of humidity, is the British sound itself. The combination with the company's 303 power amplifier is also an attractive system. The appearance, dullness, and feeling of use can be seen. Serial 52112 (Murakoshi Yoichi)
Maintenance information: 2025.8.28 Maintained (volume contact cleaning) 2025.6.19 Maintained (main VOL dismantling, slider repair cleaning. Balance VOL exchange. Replace C in other power supplies and C in PHONO/LINE. (Power SW spark killer replaced, changed to 100V specification)
Accessories: power cord, input/output cable, instruction manual (copy)
Main specifications: external dimensions W550 x H110 x D220 mm, weight approx. 7.4 kg (actual measurement) [33] 3 input/line systems, 1 phono system (MM) [FM3] tubular FM dedicated tuner with automatic stereo/mono switching
The disposal price has been reduced. Member prices are not applicable. 2025/7/12 sales price 128,000 yen Maintained! Quad power amplifier Despite its compact body, you can enjoy a smooth, thick sound. It really goes well with speakers made in England, and makes you listen to 70s analog sound with a sense of dynamism. There is dullness and small scratches (Sasaki Shota)
Maintenance information: 2025.7.12 Maintained (drive transistor (BD244 x 4), power transistor (MJ15024G x 1), and original differential op amp (TL071 x 2) parts were replaced. The connection cord and power cord have been attached.
Input/output waveform confirmation, left and right sound pressure level checks, load tests, and comprehensive operation tests were performed to confirm normal operation) 2025.6.9 maintained (there is a pattern short in the board, poor output board mounting, capacitor deterioration, block C lead wire soldering, driver transistor deterioration, operation check)
2024.8.6 Maintained (all internal parts checked, LCH power stage TR x 1 half short NG replacement, DC cut C replacement within the board, replacement of bottom cover rubber foot defects, operation check)
Accessories: copy of manual, power cable, connection cable
Main specifications: 100W+100W frequency characteristics 20 to 20 kHz dimensions W341 x H115 x D195 mm weight 9 kg