I have a used Matched Pair of AMPEREX ORANGE GLOBE 6DJ8 ECC88 VACUUM TUBE 1969 MATCH PAIR SWEET WARM TONE A41J for sale. I cannot say how many hours of use they have, at least 40 hours, but they are still running strong and sound amazing. Asking $45 for the pair which includes 2-day priority mail shipping. Packed with the utmost care. If you have any issues with them at all, I will promptly give you a refund. Just tested them this morning (5/12/16) and they sound amazing. CONUS Only Please. Message me if interested. Thanks!