I am selling my Mullard ecc35 6sl7 brown base tubes. These tubes were bought from TubeDepot only 11 months ago and havent been used very hard. I would say i average listening 3 days a week maybe 2 hours max. Maybe every so often on the weekends i might listen for 3 or 4 hours. They are balanced triodes and matching pair. They are mullard tubes made in the Blackburn, UK factory and rebranded as Philips. They have early D getters and have Blackburn code dates on them. I have the original boxes too. These are some really powerful tubes that can help drive harder to drive headphones. They have some warmth and will provide tons of dynamics. My ZMF cans really came alive with these tubes. I am moving to another amp so I won't be needing them unfortunately! If interested message me and we can talk more! Also I can get more pictures if needed. These were all I had on me while I'm at work tonight. Thanks!