I just had this built and do agree with the people who claim that once you go to a DHT preamp, you'll never go back to IDHTs again. Just got it on Saturday and am already hearing more natural holographic detail out of my system than ever before. Really looking forward to the full journey as all the iron breaks in. Just sold my wonderful and heavily upgraded Don Sach's DS2 6sn7 linestage. I only have one source, so I'm just using it as a voltage gain device, but multiple source switching is available.
https://simplepleasuretubeamps.com/2020/12/30/shiny-eyes-eml20a-preamplifier/
https://simplepleasuretubeamps.com/2020/12/30/shiny-eyes-eml20a-preamplifier/