The characteristics of the KT88 tube are as follows:

High power: KT88 tubes typically have power up to 60 watts or more, so they can be used in high power audio amplifiers.

Wide response: Because of its wide frequency response range, the KT88 tube is commonly used to design hi-fi audio power amplifiers.

Durability: KT88 tubes usually have very good durability, so they can last a long time without damage.

Reliability: Compared to other similar tubes, KT88 tubes generally have higher reliability and stability.

Natural tone performance: KT88 tubes tend to have natural, delicate tone performance, so they are widely used in audio amplifier and power amplifier designs.