My name is Kelly and here is my review of the TUBES4HIFI VTA70 and SP-13 kits.
I searched for a long time to find a preamp that would make me happy. After a considerable period of time and several failed purchases I decided to build my own and after reading volumes of information on the internet and comparing circuits, I decided on the Aikido tube topology.
I was new to the tube world and decided to buy a tube amp first and get acquainted with working with tube gear. I purchased a rebuilt Dynaco ST-70 and after a short time started looking for ways to improve it. I happened upon TUBES4HIFI and this is where the magic of my journey began. I purchased the VTA70 octal driver board replacement from Roy and naturally had questions first which Roy answered in short order to my satisfaction. I ordered the assembled kit as I was too lazy to put it together myself. The kit arrived very quickly, well packaged and very nicely assembled. I got busy gutting my Dynaco and installing the VTA board. Following Roy's instructions was a breeze and I soon had it up and running.
"Here is the magic part".
The amp biased up easily and then the listening tests commenced. I drove the amp directly from a quality SACD source with variable output, closed my eyes and started to listen. "I started to smile almost instantly"! I then realized that the music was over and I was feeling all warm and fuzzy. This was the experience I was hoping for. I was so impressed with the VTA70 kit that I decided to buy the SP-13 preamp kit from TUBES4HIFI and I have had a continuing experience that was excellent.
After working on assembling my preamp, I finally got to a place where I could start listening tests and I must admit that the SP-13 preamp did not disappoint. I have been having a real love affair with this preamp and have spent much time tube rolling and have discovered audio nirvana.
I would strongly recommend both the VTA70 and SP-13 kits if you are looking for a quality audio experience. The boards and kits are top notch and well designed, and Roy is helpful, knowledgeable and courteous.