Vacuum tube HIFI DIY Psvane 300B-L UK 300B UK-300BL 

Free shipping with tracking number.

1PC with paper box
2PCS= 1 MATCHED PAIR  
4PCS= 1MATCHD QUAD 

Identical to    300B = WE300B = 4300A = CV2609
Similar Tubes    
Normally replaceable-slightly different:
  PX300B
Other class quality (otherwise equal):
  300B-98
Predecessor Tubes    300A  

Base    UX-Base (4 Pins (2 thick, USA 1924, UX)
Filament    Vf 5 Volts / If 1.2 Ampere