Koreeda's control amplifier published in Kingdom of Tubes Vol.19. A product that omits tone control and narrows down the functions. The volume can be adjusted in detail using a large 41-contact P type attenuator made by Tokyo Hikone. The sound is clear and clear with a sense of speed. The exterior is dull and some lettering has disappeared (Tamura Eiji)
Maintenance information: 2023.8.27 Operation confirmed (bubble noise comes out when VOL is turned, but the specifications are due to the characteristics of Tokyo Hikone attenuators)
Accessories: power cable
Main Specifications: 4 Inputs, 2 Outputs, W360 x H140 x D245mm, Weight 6.9 kg
Disposal Markdown. Member price is not applicable. 2021.3.12 Sales price 198,000 yen overhauled. Only the preamp part QUAD22 of the QUAD masterpiece 2+22. Dedicated power supply unit included so that it can be used as a preamp alone. Since it can be pre-out from a box of a separate enclosure, it can be combined with tube bulb power amplifiers from various manufacturers. The sound of dark eyes with good grainy unique to vintage QUAD is attractive. There are small scratches and dullness corresponding to the age (Sasaki Shota)
Maintenance information: 2021.3.12 Maintenance (degraded vacuum tube replacement, lamp defective replacement, balance volume replacement, Mylar capacitor 4700pF degradation exchange, 2 film capacitors 0.1 μF other defective exchanges 4 resistors 1W degradation exchange 4 resistors 1/2W degradation exchange 2, gang error reduction measures → Radio input only 1/2 W additional resistance 2, RCA jack and vacuum tube Socket caulking repair, power unit hum balance readjustment. (Other operation checked including separate power supply at AC100V)
Accessories: Description, Power supply
Main Specifications: Tube sphere control amplifier input PHONO, RADIO, TAPE W267 × H88 × D153mm Approx. 3kg
With a dedicated power supply so that it can be used with a pre-unit! Only the QUAD 22 control part of QUAD's masterpiece 2+22. It can be combined with tube amplifiers and transistor amplifiers from various manufacturers. The rich, grainy sound unique to vintage QUAD is attractive. As for the appearance, you can see age-like abrasions on the hood. Serial 42543 (Satoshi Yoneshima)
Maintenance information: 2018.8.29 Maintained (balance volume replacement, block capacitor 20μF × 3 electrolytic capacitor replaced 3 pieces, electrolytic capacitor 50μF exchange 4 pieces, resistor 1/2W 3 replacements, 8 additional 1/4W resistors, 10 Mylar C4000pf other exchanges, power supply stopper replacement and 2 additional pieces. (Operation check including other power supply parts) * This model has been changed for separate power connection and built-in Phono/Tape adapter)
Accessories: Instruction manual copy (English), circuit diagram copy, power supply
Main specifications: EF86 × 2 ECC83 × 2 Input PHONO, RADIO, TAPE W267 × H88 × D153mm Approximately 3kg