This part is a kind of semiconductor called 6BM8.

Function of this product has Triode and Pentode.

Manufacturers : Svetlana

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Some of the text within the PDF file :

Svetlana 6BM8 High Performance Audio Dual Package, Triode and Pentode T he Svetlana™ 6BM8 is a single glass envelope containing both a power pentode and triode. It has a pentode plate dissipation rating of 7 Watts with convection cooling. A single 6BM8 may be used as an economical low power mono block amplifier or a pair of 6BM8's, in ultra linear configuration are an excellent choice for more power. The 6BM8 is also a great choice as a driver for higher power tubes, such as the Svetlana SV811 and SV572 series triodes. It has an indirectly-heated oxide cathode, which may be DC operated for the absolute best hum/noise performance. Close manufacturing specification tolerances and improved processing provide enhanced reliability and superior sonic performance. The high sensitivity of Svetl [ ... ]

6BM8 PDF Datasheet Download