Good voice! I give this KT88 PP 9.5 points! Highly recommended! After 10 days, It finally arrived in California. The machine is very heavy, especially at the transformer end. It is full of materials and needs to be handled carefully.
As soon as I open the box and power on, I feel attentive. The high voltage is sent slowly for about 30 seconds. This is because the KT88 lamp is long, 1.6A, and the heating time is slow. If the high voltage is sent too early to pull the current, then the front tube and high voltage filter capacitor are easy to be damaged. I haven't heard of the original factory's front-end and push, split phase tube, directly replaced with the old Telefunken 12AX7 and old Mullard 12au7 (need adapter), European small tube sound. One minute later, press bias 1.2.3.4, very good, eh KT88 is set at 55mA, factory test has been adjusted. I like the transformer of Yaqin. It's not too hot, and the bandwidth of the output transformer is very good. I was impressed when I bought the el34 PP a few years ago. Let's sing! The low and medium frequencies are surging in, pushing the 87db Dynaudio C2 into the air! Medium high frequency elegant, gentle, no ear scraping, very smooth. High frequency has a little layer of yarn, which can be said to be full of tube flavor and better fineness - try gold lion KT88 later!
The Bluetooth design is very intimate. The sound quality of 5.0 Qualcomm chip is not to be said. Once the mobile phone is connected, it can be paired. Sitting on the sofa and pouring a glass of water, it is quite convenient! Suggestion: the bias current should be adjusted further away from the pipe. Add headphone hole. The rest is perfect!
