I have been into Audio for over 40 years and have had every type of preamp
Out their. The Best I havd found similar to a SET amplifier for only ond stage purity
Is a Direct Heated Triode Preamplifier. The sonic purity is second to none .
Also when buying commercial built products if you are lucky.just 25% of thd
Product is the cost to build it a $10k preamp maybe $2-k in parts at best yhe rest overhead ,45-50% dealer markup.
I went yo Audio engineer Radu Tarta, he built me a fantastic Dual mono
Pass labs F6 , then this Fantastic DHT preamp . I get to choose options
On every level . For example look at your power supplies no name average after best. In hear Lundahl from Sweden, plus chokes for further filtering 4 pole capaciyors Mundorf or Jensen in the power supply, single chassis or 2 box seperate power supply and still much less money then a commercial unit
And put it to shame in brand name parts quality. Unless you have tried a DHT preamp in uour system you have not heard it's potential at its purest.
I am having another one built look at even the volume control I have thd Latest Khozmo with remote the ball bearing action ,most gave thd pathetic Alps blue velves you loose a lot of purity evrn through the volume. Slagle transformer volume a little better still but $1-k ,I took the Khozmo at $400 just an example
Of possibilities and options. The Only possible down side is if your speakers are
Super efficient, or some amplifiers gain too high , thd majority of equipmrnt
Are fine. We'll worth inquiring ,.if looking for a fantastic pre with quality remote
For $2-k the fantastic tube 4P1L Vacuum Tube and name of preamp model.