You are bidding on a Philco type 45 radio/audio output tube.  It is a globe shaped tube equivalent to a type UX-245 tube.  It tests very strong at 96% of the specifications for a new tube for emission, Em and 99% of the specifications for mutual conductance, Gm, on my Amplitrex AT-1000. It is in nice clean condition with bright silver getter, and it even still retains its original Philco paper sticker.  It should be great for use, especially for a Philco radio to make the tubes all Philco.  Shipping weight is 12 ounces.  Please see my other auctions for additional interesting early radio and audio items and tubes.