Hi Rja
With a tube phono I really like the Sovtek 12AX7LPS tubes and the newer Mullard CV4004/12AX7 tubes.
With a Jolida Tube DAC 2 I really liked the Genelex Gold Lion 12AX7 tubes.
In my Jolida amp my favorites are the JJ 5751 tubes, and Ruby 12AX7AC7 HG+ aka TAD 7025-S and Preferred Series 7025.
Sorry if I'm confusing you. I enjoy all of these tubes and haven't had issues with SQ, build quality or endurance. A majority of these tubes were purchased via Doug's Tubes, Jim McShane and Upscale Audio. That may be why I haven't had any issues.
With a tube phono I really like the Sovtek 12AX7LPS tubes and the newer Mullard CV4004/12AX7 tubes.
With a Jolida Tube DAC 2 I really liked the Genelex Gold Lion 12AX7 tubes.
In my Jolida amp my favorites are the JJ 5751 tubes, and Ruby 12AX7AC7 HG+ aka TAD 7025-S and Preferred Series 7025.
Sorry if I'm confusing you. I enjoy all of these tubes and haven't had issues with SQ, build quality or endurance. A majority of these tubes were purchased via Doug's Tubes, Jim McShane and Upscale Audio. That may be why I haven't had any issues.