The Amperex 833A is a vacuum tube, constructed for medium power oscillator or class B or C amplifier applications. It is a medium-mu power triode with 300 watts CCS or 350 watts ICAS anode dissipation. The long grid and anode leads, plus high internal capacitance, limits this tube to 15-30MHz maximum frequency. Being medium mu, it is normally not suitable for grounded grid operation.These tubes are from the collection of a ham radio friend whose basement we are cleaning out so he can downsize his house. Because of the box we initially thought it was a single new tube but in fact the box contained what appears to be several used tubes. Condition is unknown as I have no way of testing them, but my friend would not have saved these if they were known bad.Three tubes are available. See the photos which show the actual tubes. The box they were in is shown too, but that will not be included as it\'s huge and sending it would make shipping prohibitive.

---