Philips Heerlen ECC83 and Mullard factory Blackburn 12AX7 matched pairs NOS

For sale are NOS matched pairs Philips Miniwatt ECC83 12AX7 from the'Heerlen' factory. Price is for a matched pair. These are one of the best sounding tubes and a great NOS replacement for any stock or NOS tube. All excellent tested rare matched pairs of this famous Philips tubes. Some of these pairs are made by Mulllard in their famous Blackburn factory. I also sell: EL34, 6P3S-E, EL84, ECC81, 5755, ECC82, EL82, 6P15P-EV, 6N3P-DR, 6N3P, 6N2P-EV, 6N1P-EV, 6N6P etc. I'm going to list more matched tubes (Amplitrex AT1000) the next few coming months.