The amp arrived on schedule in the Pelican case without a scratch. Thanks for the careful handling guys! I decided to start things with the EL34s. Based on Steve's earlier listening comments with the KT66s, I ordered a set of those and have them in hand as well. I'm running with a Cary SLP-98P active preamp and JansZen zA2.1 speakers.
I ran music last evening for about 5 hours and couldn't help but do some listening. I think I'm using the 8 ohm setting, no bass damping, and have the reconstructive feedback circuit active. That combination seems to be the better choices respectively. Hard to tell if that is how I have it set without markings and no MK IV user manual yet.
When the amp shipped I was sent a link to the MK III user manual which helped with tube insertion guidelines, but could not help with the new MK IV switches. I assume a dedicated manual will follow and I was able to piece together what did what from Steve's earlier feedback. I had a number of weeks to study up.

Since this is my first Decware piece I'll let others tell me what to expect during break in. I can say that, as expected, the sound needs to mellow out. The upper frequencies are a little forward and in your face, and I'm hoping the bass will emerge with a little more authority as well. I'm not concerned as this is right out of the box, but I've never owned a tube amp in the past. I do understand break in however. I had some Maggie speakers that took 6 months to fully relax enough to release the bass fully.
I'm thinking I may give the KT66s a run tonight just to get a quick feel for the differences. The fun is just starting. BTW, I did the figured black base and it looks very cool with the black top plate. My wife gave a thumbs up on the textured finish and overall look as well.
Scott