@smodtactical I've built two SP14 preamps using the tubes4hifi.com boards. You can build it for less than $500 including upgraded capacitors. The build is quite straightforward with building and wiring to the chassis the biggest pain. The SP14 sounds very nice but it doesn't outperform my heavily modded Cary SLP-70 although it comes close. I have yet to succeed in building a SP14 that is completely quiet so that will be a problem if you are planning on using it with efficient speakers or a high powered amp.
