I have a bunch of Ayre equipment, and have owned tube gear for a long time including a Joule Electra LAP 150 preamp.
For the Ayre stuff, at around $2k used - K-5xeMP. That is not their Variable Gain Tech, but it is REALLY good. Absolutely black hole quiet - zero noise.
If you want the Variable Gain Tech from Ayre, look for a used KX-5 Twenty. It is outstanding. I have an Ayre KX-R Twenty because the KX-5 Twenty was so good I figured I might as well buy the best preamp I was aware of.
If you have not heard the Ayre "Diamond Circuit" stuff, it is worth knowing what that is. It is very different, and I absolutely love it.
My Ayre KX-R Twenty: