Not sure if it'll help,but I used different brands,but 3 of the same tubes (singles) . 3 in phono and 3 in linestage. Being as the linestage was used for digital I used a softer warmer tube ( Gold Aero "Yugo" Platinum ) and in the phono I used a nos British trio. Never had a problem and worked very well.I would suggest at least use trios as the same,but not necassary to be the same in linestage and Phono section.
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