This is the latest 845 version by Shguang, released in Novenber.
Enlarged bottle but Monocrystalline Carbon inner coating, it looks like” black bottle”, it help absorb and send out heat quickly, so better heat dissipation than any other 845 tubes and at same time it prevent from clutter interference outside, so the pure sound is ensured.
The cathode emission is improved 10% due to the Germany imported thorium&tungsten, so it could supply enough power.
The gold coating gate prevent from radiating, the noise is reduced much and the lifetime is longer.
High pressure resistance design, non flash inside anymore.