It is just over your budget and it is tube preamp.
Not exactly what you are looking for but definitely worth a look. It has HT by-pass. The unit does not have to be "ON" for this function to work so you save tube life in a long run. It is battery powered preamp - no noise, no power issues. And most importantly, it sound awesome.
Dodd battery powered preamp
Another place that sells it....for a bit less
Mariusz
Not exactly what you are looking for but definitely worth a look. It has HT by-pass. The unit does not have to be "ON" for this function to work so you save tube life in a long run. It is battery powered preamp - no noise, no power issues. And most importantly, it sound awesome.
Dodd battery powered preamp
Another place that sells it....for a bit less
Mariusz