We have a small stash of these highly regarded and rare ECC35 / 6SL7GT. We have mostly Philips branded and Mullard branded tubes. All of our stock was made by Mullard in the Blackburn, UK factory. All have early D getters and bear the Blackburn date codes. Additionally, we have both brown base and black base versions. If you order matched tubes, we will send like brands. If you are wanting something specific, just ask and we’ll see if we can meet your needs.