GE JG-5751 Black Plate 3 Mica Tube w/Green Painted Tip, Tested well and balanced on my Hickok 539B, no shorts or microphonics low noise tube, with the green tip it means it's been screened for noise. Test results are 1700/1650 , tube is in good condition the min. on this tester is 875 for this tube. date codes are 56-39  57-04  188-5 Mailing with USPS First Class Mail the next day of receiving your payment.