It's going to be hard to find an SET amp even a kit for $1500. The Audio Note Kits Kit1 300B is a good amp for $2500. The "problem" with SET amps is there are so few parts that parts quality is crucial especially output transformers which can be quite pricey.
https://www.ankaudiokits.com/2/Kit1-2014-300B-Integrated-Power-Tube-Amplifier.html
https://www.ankaudiokits.com/2/Kit1-2014-300B-Integrated-Power-Tube-Amplifier.html