For $13 large, a fella could buy lots of good preowned tubed preamps. A few used models that pop into mind are:
1) Reference 40 by Audio Research, separate signal and power supply chassis
2) VTL 7.5 Mk III - Same as above, two chassis
3) VAC Renaissance Mk II - 2 chassis
4) Lamm L2.1 Reference - 2 chassis