I dont own those Tesla tech. Beyers but Crack works well with all my hi impedance phones, including my 120 ohm AKG's. I have Beyer 880's and 990's, both 250 ohm and they are fantastic. I see no reason why it wont be a great match with the T1's or T90's. There is/was atleast one member here with T1's. Try a search in this forum.