Vintage RCA 6D6 Radiotron electron tube in its original red, white and black RCA box. The 6D6 is a 6-pin remote-cutoff RF pentode with a top grid cap, used in 1930s–40s console and table radios. The black base is printed RCA Radiotron Electron Tube. Untested; sold as found. The box has torn and worn corners and some spotting on the label panel.

A useful replacement for antique radio restorers, or a display piece with its period box.

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