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2 Vintage Cetron / UM 4B31 / RK4B31/ CV3510 Premium Audio Vacuum Tube Valve- Bangybang.tube

Listing includes 2 tubes.

Brand: Cetron / UM

Type: Premium Subminiature Audio Tube

Model: JAN 4B31

  • Metal Base
  • Military Issed and Packaged
  • Original Factory boxes included

Country of Manufacturer: USA.

Collectible item.