The trick to getting tubes to be really quiet is the same that is used by transistors- fully differential circuits with really good constant current sources, with a well-regulated bi-polar power supply
This is not to say that such a circuit will be as quiet as the very quietest transistors, but it will sound better and will be quieter than many transistor circuits as well.
Many well-regarded 'tube' phono sections are actually hybrid. Just my opinion, but the idea of installing a solid state filter at the input of a phono section does not work for me. If I'm going to have analog, I want all the detail and the smoothness its known for...
This is not to say that such a circuit will be as quiet as the very quietest transistors, but it will sound better and will be quieter than many transistor circuits as well.
Many well-regarded 'tube' phono sections are actually hybrid. Just my opinion, but the idea of installing a solid state filter at the input of a phono section does not work for me. If I'm going to have analog, I want all the detail and the smoothness its known for...