Maintenance completed, including replacement of 4 output tubes with new ones! Sun Valley KT88 push pull As it looks, it is similar to the Macintosh MC275, and the sound has a bright, vibrant, and supple impression. The sharpness, which is more responsive than a normal transistor amplifier, is attractive. You can see a feeling of use, such as appearance, dullness, disappearing characters, scratches, etc. (Kobayashi Hitoshi)
Maintenance information: 2026.5.14 maintenance completed (output tube and electrolytic capacitor replacement due to left channel cathode bypass capacitor puncture, power supply capacitor replacement, input volume replacement, vacuum tube pin cleaning, bias check output voice check)
Accessories: power cable
Main specifications: KT88 push-pull rated output 40W+40W vacuum tube KT88 (made by Electro Harmonix) x 4, EL84 (made by SOVTEK) x 4, 12AX7 (made by Electro Harmonix)
×2 4Ω/8Ω compatible W430 x D270 x H200 mm 18 kg
Pair tube Sun Valley sorting ball beam output tube measurement value 64/62 (rejected value 44) There is dullness on the base part with the original box ※The measured value shows the gM value measured with the test machine TV-7 (Kojima Yosuke)
Accessories: original box (with writing)
Pair tube direct heat triode Sun Valley sorting ball made in China measured value 58/56 (rejection value 38) There is a slight burn on the tube head ※The pair is determined based on the gM value measured with the test machine TV-7 (Kojima Yosuke)
Accessories: none