You are bidding on a pair of Philco type 71-A radio/audio output tubes.  These are new old stock tubes in their nice original boxes.  They are equivalent to Cunningham CX 371-A or RCA Radiotron UX 171-A, except they have the later ST shaped envelopes.  On my Amplitrex AT-1000 tester they test strong, one at 83% of the specifications for a new tube for emission, Em, and 100% of the specifications for mutual conductance, Gm.  The other tube tests at 82% Em and 105% Gm, so they should make a nice pair.  They are identical, with the same date code, N4.  The previous owner has scratched his testing data 41 1/2 (P) on the base of each tube,  Also added is an elongated rectangle with 71-A inside, below the Philco name.   They should be great for your radio or amplifier project.  Shipping weight is 8 ounces.  No shipping to China.  Please see my other auctions for more interesting radio and audio items, and tubes.

---