VINTAGE KL1 RADIO VALVE VERY RARE for museum collector builder tube enthusiast. SOLD AS SEEN HERE ON E-BAY FROM HOUSE CLEARANCE, (Vintage Radio Collector) SOLD AS FOUND FILAMENT AVO TESTED OK, SEE LINK--- http://www.r-type.org/exhib/aaj0102.htm THIS ITEM 1920s IS A VERY RARE THERMONIC VALVE AND WE HAVE NOT SUBJECTED IT TO A VALVE TESTING MACHINE. VALVE LOOKS IN EXCELLENT CONDITION AND WILL PROABLY WORK FINE (But Thats up to the Buyer} PLEASE DO NOT ASK US TO DO ANY FURTHER TESTS ON THIS ITEM BECAUSE OF ITS RARE & FRAGILE NATURE, WE WONT. SOME AGE RELATED MARKS AND SCRATCHES, ALL OUR VINTAGE ELECTRICAL ITEMS WORKING OR NOT ARE SOLD AS SPARES OR REPAIR AND OR FOR RESTORATION, NO RETURNS HAS ORIGINAL BOX UK BIDDERS STRICTLY CASH ON PICKUP. No Posting on This Item Due to Fraudulent Breakages & False Returns. OVERSEAS BIDDERS CONTACT ME BEFORE BIDDING TO ARRANGE SHIPPING WITH E-BAY GLOBAL SPECIAL ATTENTION TO PACKING. STRICTLY Cash On Collection in U.K., Im based in Burnley Lancashire, Sorry but no U.K. shipping, I will definitely not post this Item to any Buyer in The U.K. (Unless its to the E-BAY Global Depot U.K.) Please feel free to ask questions if needed. Please dont bid unless you fully understand my terms.