Your McIntosh Tube preamp in picture must be a maintenance nightmare.
I had same bad experience with a AR sp-11 phono/line pre-amp 20 years ago. I bought the unit based on great audiophile commentator Mr. Chen's recommendation. I was impressed with the phono stage performance. Howerver, very soon, I ran into multiple tube bias issues and component(s) failures. I felt a pre-amp should not require to be baby sitting every 6 months to keep running at optimal state, so I gave it up.
My current hand made line stage preamp are all single tube stage amplifier based on famous Western-Electric "Ultra path" circuit using best nickel signal transformers and Teflon coupling capacitors, and it out perform AR SP-11 by a big margin.
Furthermore, tube type matters in line pre-amp. 26 direct heated triode sounds best in a cost no limit pre-amp design.