SLVU2.8-8A1 SLVU2.8-8A1 超小型管 SLVU2.8-8BTG SLVU2.8-8G SLVU2.8-8G-LF SLVU2.8-8G-LF-T7 SLVU2.8-8-LF SLVU2.8-8-LF-T7 SLVU2.8-8-MS SLVU2.8-8-T7