KR PX-25 matched pair

I bought these tubes from a trusted seller on another audio mart .They were brand new in the box. He acquired them when he bought out some remaining stock from a former KR distributor, but never used them. I rolled them into my Lampizator Golden Gate Dac and played some music files continually for around 50 hours, then listened to them a few evenings. They are the most dynamic output tubes I have tried in the Dac, but I preferred the sound of 2A3's thus the sale.