No doubt, buffer amps can be a good choice for certain applications. I made this one just to sell. I enjoy the building of these projects. This unit uses two 6922 tubes, and sports a really heavy duty power supply. One transformer for the heaters, and one transformer for the audio circuit. I even added a two position switch so that you can turn on the heaters first and then the audio circuit second. The input is a 1/8" stereo jack, and the outputs jacks are RCA. Silver signal wiring, and attention to detail make this an easy choice for enhancing a device that uses an 1/8" output. Of course, I will include an adapter for the use of an RCA input if needed.
 $225 is more than fair for this unit, and the buyer will be very satisfied with the performance.