@motorheadflash I think you are making the right decision. Why have the doubt that tat your tubes are sub-optimal when you are using one of the word's best amps?
Which tubes to buy
I have an Audio Research Ref. 160s power amplifier. It's almost time to replace the tubes. This will be the first time I replace the tubes in this amp. In the past I have purchased tubes for my Ref. 6SE preamp directly from Audio Research or Upscale Audio. Audio Research furnishes Tung-Sol KT 150 tubes with the amp. and also as replacements. Recently I have found PSVANE brand tubes available. Does anybody have experience using these tubes? I'm trying to get the best sound quality. Tung-Sol made in Russia have been around a long time. PSVANE made in China is new to me. Any suggestions or recommendations?