Up for sale is a highly collectibleDe Forest Audion 4-Pin Vacuum Tube, an early triode tube that represents the dawn of electronic amplification and radio technology. Type: De Forest Audion triode.
Up for sale is a highly collectibleDe Forest Audion 4-Pin Vacuum Tube, an early triode tube that represents the dawn of electronic amplification and radio technology. Type: De Forest Audion triode.