Refresh by replacing the main volume, replacing deteriorated capacitors, etc.! It is a model that was sold between the first stereo preamp C20 and Tubyu's last preamp C22, and was only sold for a very short period of time. The highly perfected sound made during the maturity period of vacuum tube amplifiers, which is a bit different from C20 and C22, is attractive (Sasaki Shota)
Maintenance information: 2025.5.16 maintained (main volume replacement and extension shaft added/block capacitor 40/20 μF etc. deterioration replacement 2, 40 μF deterioration replacement, wire loss countermeasures → lead wire replacement 16, switching noise reduction measures → 1/4 W additional resistor, 6 additional spark killers, 2 additional short pins, vacuum tube socket and RCA jack caulk repair
(*Operation has also been checked with AC 100 to 117 V)
Accessories: none
Main specifications: use ECC83 x 6, W388 x H179 x D360 mm, weight 7.46 kg