HIFI  tube AMP audio Psvane 2A3C 2A3 Vacuum Tube 

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

Identical to    2A3 = VT-95 = CV1831 = KX2A3 = NU-2A3
Similar Tube  2A3H ; 38213 ; 845_radio-tube ; PX2A3
Other class quality (otherwise equal):
  2A3-B ; 2A3-C
Different maximum ratings:
  2A3-40W
Heater different:
  6A3
Other base and other heater:
  AD1
Multiple differences or of other kind:
  1607_RCA 5930

Base: 4 Pins
Was used by Radio/TV-reception etc.
Filament    Vf 2.5 Volts / If 2.5 Ampere