I HAVE 2 RARE NEW OLD STOCK BENDIX 6900 GOLD PIN TRIPLE MICA TUBES. THEY HAVE MATCHING CODE DATES OF 65-48. EXCELLENT TUBES IN THEIR ORIGINAL BOXES. THESE ARE CONSIDERED THE HOLY GRAIL OF 5687 TYPE TUBES. TRIPLE MICA CERAMIC SPACERS. ORIGINALY USED IN MISSILES ( ICBM ) AND MILITARY AIRCRAFT. AUDIOPHILES ABSOLUTELY LOVE THESE RARE TUBES. THEY ARE ABOUT AS PERFECTLY MATCHED AS YOU CAN GET. PHOTOS OF MY TESTING RESULTS ARE VERY ACCURATE. I HAVE TESTED AND SOLD THOUSANDS OF TUBES USING MY JACKSON 648 TESTER AND NOT ONE TUBE HAS EVER BEEN RETURNED. READY TO USE OR TO COLLECT. ANY ISSUES YOU MAY RETURN THEM FOR A FULL REFUND.