Up for auction is what I believe to be an 833 transmitting Vacuum TubeThis tube came from the estate of a ham radio e nthusiast. There is no markings on the tube so I do not know the brand or the tube number. I have no way of testing the tubes so it will be sold As Is, No Refunds. Please email me if you have any questions. Working condition is unknown. I will be auctioning more tubes from this collection so check back. Thanks for looking. ******Attention International Bidders******* A handling cost of $3.00 will apply to international orders due to the extra packing that may be required for the item to ensure a safe shipment. Shipping cost may also vary from the shipping calculator due to box size and weight changes for international shipping. Please wait for an invoice before making payment.