SOLD!! I originally purchased this tube back in April. It was sold as NOS and fully tested to be in new condition on a calibrated tube tester. I do not have equipment to check it but I have only used it for ~60 hours. I can only assume it's still in excellent condition. No channel imbalance and it is not microphonic. It sounds wonderful, but I don't really need it anymore as I'm trying to clear out a lot of my unused equipment and tube amps. I am asking $85 including Paypal fees and shipping to CONUS. I will ship outside CONUS but buyer assumes all shipping and associated fees.