6BL8
The 6BL8 (European equivalent ECF80, Russian 6Ф1П) is a triode and pentode in a single tube with a B9A (Noval) miniature 9-pin base.
The 6BL8 (European equivalent ECF80, Russian 6Ф1П) is a triode and pentode in a single tube with a B9A (Noval) miniature 9-pin base.