I've recently bought four 12AX7 Hit Ray tubes (Hitachi-Raytheon joint venture,made in Japan) for my Phono preamp which only uses two tubes. On the ebay listing for these tubes it's stated that they are tested. Bellow there's a summary (copy and paste) from their specs as stated by the seller. How would you match these tubes in pairs according to their specs? Tube 1 with tube 4 and tube 2 with tube 3? I know Tube 1 with Tube 2 are a perfect match but then tube 3 with tube 4 would be a less than ideal match. What is your advise at matching these tubes in pairs? Thanks in advance. " 4 Vintage Hit-Ray Japanese made 12ax7 vacuum tubes. New in box. Tubes have been tested on a Calibrated Hickok TV7 tube tester and test as follows: Tube1 : 50/52 Tube2 : 50/52 Tube3 : 54/48 Tube4 :48/46 Minimum good value on a TV7 tester for a 12ax7 tube is 32. The tube tests within the NOS range!"