Let me tell you what I'm running:
Sunfire Cinema Grand amp
Rotel RSP pre-amp/processor
Marantz CD player (middle of the road)
Tannoy 637 speakers
Blue Jeans home made cables
I made a post about speakers a while ago and my Tannoys being "bright" or harsh on the top end. I plugged in the amp, nothing exploded, I plugged in the output tubes, nothing got fried, I set all the bias values, then switched the cables out of my Cinema Grand into the 70. At first I thought something was very wrong, because I was SURE I unplugged my subwoofer (I listened to the Tannoys first without and with the subwoofer), but something was wrong. The little VTA 70 had MORE bass??? No way, I got up and made sure the sub was unplugged. Yup. After flipping through some very familiar music, I can tell you that YES, you can hear a difference with tubes (sorry for my exhuberance this is my first tube amp.) I am stunned by the warmth and how my Tannoys are suddenly better. But, it gets even better. I had it in pentode mode. I flipped to triode mode, and it got a bit quieter, and my somewhat bright Tannoys now are totally different speakers. My symphonic music is better, Dean Martin's Christmas disc suddenly has a real upright bass player where I can visualize the slap of the bass player on the strings.
I have yet to build out my entire system. I can only imagine what will happen when I try tube amps, perhaps a turntable (my eye on a VPI Traveler at Audio Classics) and new speakers.
So I have three messages.
First to Bob: THANK YOU. A great, easy to follow product that exceeded my expectations.
Second: to anyone who is on the fence, just find a way to buy one of these and build it. The satisfaction is incredible.
And finally, thanks to all of those who helped along the way and who kept posting the truth about these amps, thanks to you guys I'm going to go broke quickly. Do I even dare ask what "tube rolling is?"
If you'll excuse me, I have about 3,500 CD's that need to be listened to again.