A vacuum tube premain amplifier from Oto Kobo, a manufacturer in Kanagawa prefecture. Deluxe type that has been changed to a bass boost function and a gold-plated SP terminal. I tried playing it at the store, but it sounds more than the size, and there is a sense of volume in the low frequency without bass boost, and the impression is that the resolution is exceptionally high compared to old vacuum tube amplifiers. It is also recommended for getting started with ball amplifiers and sub units. You can also enjoy the beautiful vacuum tube lighting function by appearance (Shota Sasaki)
Maintenance information: 2022.8.12 Sound output operation confirmed
Accessories: manual, power cable
Main specifications: Super triode connection 3W+3W (8Ω) Headphone output 50mW+50mW (at 60Ω load) W180 × H148 × D265mm 5.5 kg
※Currently sold super three-link single amplifier. The white exterior has a clean feel and looks great. It has a good response and reproduces crisp bass. As for the exterior, there are no noticeable scratches. Serial 860679 (Tamura Eiji)
Maintenance information: 2023.9.17 Operation confirmed
Accessories: instruction manual, power cable
Main Specifications: PCL86 Single Vacuum Tube Amplifier 3W+3W Super Triode Connection Circuit Input Switching Select Knob W180 x H145 x D305mm Weight 4.6 kg
A single amplifier using 6L6 as the output tube. The first stage is 6N2. It comes with a volume and input selector. Both inputs are line-only. There is an LP notation on the back, but there is no phono equalizer in it. When a CD is connected, there is no noise even if it is set to full volume, but if it is close to full volume in an open state without connecting it, noise will occur. It's currently sounding well, but since it's cheap, it's currently sold without a guarantee (Yasuhito Koshihama)
Maintenance information: 2022.9.1 Over-the-counter operation checked
Accessories: power cable
Main specifications: W283 × H160 × D242 mm Weight 6.5 kg
Vacuum tube premain amplifier of unknown manufacturer. It is shaped like the Sun Valley VP-3000SE, and has been carefully made. You can enjoy the strength unique to 300B and the natural sound of a vacuum tube with good thickness. There are paint peeling and small scratches on the exterior (Satoshi Yoneshima)
Maintenance information: 2021.2.21 maintained (power switch replacement, right ch cathode condenser replacement, left ch vacuum tube replacement, left ch vacuum tube socket replacement, power primary circuit 5A fuse replacement, Normal power tube current value determined by continuous operation test after parts replacement, non-distortion maximum output operation confirmed: 16.8W/8Ω However, measured at Rch* Residual noise 1.6mV Damping factor DF: 6.7 (at 8Ω) Output bandwidth: 5Hz to 24Khz)
Accessories: power cord
Main specifications: 300B ✕ 4 6SN7 ✕ 4 W388 ✕ H205 ✕ D365mm 23.9kg
Discount price! (former price: 99,800JPY)
Pre-main amp from a French high end audio manufacturer YBA. The design is just beautiful and sound has a unique fragrance to it.
The price was significantly reduced. 2021/9/18 Selling price 118,000 yen A very thick natural wood front panel is used to stick to the beauty of the finish, and the highly transparent and glossy sound quality unique to vacuum tube amplifiers is also the most highly valued in the price range It's great to be able to do it. Because it is self-biased, the output tube can be replaced without difficult adjustment, and the difference in sound can be enjoyed by the difference in vacuum tubes. * XLR is No. 3 HOT. Serial YR1215845 (Hirotsugu Kondo)
Maintenance Information: 2020.12.15 Maintained (VOL eccentric correction, selector SW nut re-tightened. Input and output waveform confirmation, rated output test (1kHz sine wave, 8Ω load: 32W+32W, OK), sound output test)
Accessories: instruction manual, power cord
Main specifications: Vacuum tube EL34×4, 12AU7×2, 12AX7×2 Maximum output 40W+40W Load impedance 4/8Ω (10Hz-40kHz, -0.5dB) SNR 90dB input Impedance 100kΩ W350×H200×D260mm 19kg
Maintained! Yaland line-specific tube pre-main amplifier. The output tube uses KT88. It has a large output and is compatible with large speakers. Balance is 3rd hottest (Murakoshi Yoichi)
Maintenance information: 2023.3.18 maintenance (right CH output tube pair replacement film capacitor output RCA deformation replacement volume mounting part manual solder correction
* Bias check adjustment We have confirmed that each input/output check output is approximately 40W.
*The XLR input is ①② GND ③ HOT unbalanced.
Main specifications: AB grade 50W+50W push pull KT88 × 4, 12 AU7 × 2, 12 AX7 × 2, 12 BH7 × 2 W350 × H210 × D430 mm 28 kg
Maintened! Line dedicated tube primein amplifiers with incredible cost performance. A clear sound that is also recommended for modern speakers. Supple, gloss is attractive (Yoichi Murakoshi)
Maintenance Information: 2021.4.24 Maintenance (Vacuum tube EL34 replacement adjustment, transformer cover screw re-installation, volume disassembly cleaning, aging test.)
Accessories: instruction manual, power cord, tool
Main specifications: 52W+52W (8Ω) Used vacuum tubes: 6N1P × 4, EL34-B × 4 inputs 4 systems (no phono input) Frequency characteristics 20Hz to 60kHz S/N ratio 85dB W314 × H75 × D460mm Weight 16.9 kg
A vacuum tube premain amplifier with astonishing cost performance. It makes a stiff speaker sound supple and with a high degree of analysis. The appearance has a feeling of use such as dullness. (Asaine Tomoho)
Maintenance info: 2022.8.19 Operation confirmed
Accessories: Instruction manual (English, Chinese), power cable
Main specifications: 40W+40W (8Ω) Vacuum tubes used: 12AT7 × 4, EL34-B × 4 inputs 4 systems (no phono input) Size W310 × H175 × D450 mm Weight 17,6 kg (all measured value)
The price has been reduced! 2022/8/26 Selling price 19,800 yen* Since it is cheap, it will be handed over as it is. An entry machine with high cost performance. With a clean design, it is possible to input analog audio for a total of 6 systems, including the Phono (MM) terminal. In addition, it also has a built-in 192 kHz/24 bit D/A converter, making it easy to use. The exterior has a feeling of use such as dullness. Serial Y185676PR (Asaine Tomoho)
Maintenance info: 2022.8.26 Operation confirmed
Accessories: Instruction manual
Main specifications: Playback frequency band 10Hz to 100kHz Rated output 60W+60W/8Ω 70W/6Ω Analog input: 5 lines PHONO × 1 system Digital input: Optical digital × 1 Coaxial digital × 1 W435 × H151 × D387 mm 9 kg
Maintained! A compact, yet high power premain amp built with the aim of high quality. The natural, clean tone typical of Yamaha is attractive. Overall there is dullness, dirt, and line damage on the top plate (Daiki Goto)
Maintenance information: 2024.3.9 Maintained (replacement of deteriorated IC in tone control circuit. Polish all slide volumes and remote wire switch disassembly contacts and apply contact cleaner. Main board power supply circuit and other circuit board soldering fixes. (Disassemble and clean panels, etc.)
Accessories: none
Main specifications: 120W+120W (8Ω) dimensions W435 x H133 x D365 mm weight 10.3 kg
Maintained! The A-2000 is equipped with Yamaha's unique RICHNESS circuit. Settings can be made by switching between speakers, such as the company's NS-2000 or 1000M. The low frequencies with a rich sense of scale and the transparent sound typical of Yamaha are attractive, and the extravagant structure typical of the bubble period is directly linked to the sound. There are many scratches on the exterior, corrosion on the switch, and overall there is dullness (Oikawa Tetsuji)
Maintenance information: 2024.3.20 Maintained (Speaker terminals are processed and attached to something that can be obtained. CD input pin jack replacement. Other pin-jack dents etc. were disassembled and reworked. Disassemble the switch and volume contacts, polish them and apply contact cleaner. (Corrected soldering on all boards including the main amplifier board, equalizer board, etc.)
Accessories: instruction manual
Main specifications: 130W+130W (8Ω) richness circuit frequency characteristics 5Hz to 100kHz W473 x H169 x D464 mm 26 kg
Restored product with 34 transistors, 40 power supply capacitors, and other deteriorated parts all replaced. The delicate and beautiful sound, which can be said to be the origin of Yamaha Tone, has been revived with a refreshing effect. The smooth and textured sound quality of stringed instruments and vocals is so complete that it easily exceeds modern pre-main amplifiers in the same price range (Sasaki Shota)
Maintenance information: 2022.3.26 Maintained (electrolytic capacitor, transistor, SP terminal, RCA terminal replacement. Also, cleaning and re-soldering the substrate. Transistor heat dissipation sheet replacement, electrolytic capacitor transistor semi-fixed resistance fuse resistor fuse relay replacement, input waveform confirmation, load test (1kHz sine wave, 8Ω load: A class 30W+30 (W, B class 120W+120W, OK) sound output test.)
Accessories: Instruction manual copy
Main specifications: Output 30W+30W (A grade), 120W+120W (B grade) W461 × H170 × D360mm 20kg