audio valve eklipse or aesthetix calypso

I have owned the Eclipse for a year now and have not had any problems with it.

I tried the NOS tube thing and so far I have gone back to the stock EH tubes,the NOS tubes(RCA clear top)perhaps weren't up to spec,but other tube replacements were also not much better than stock.
Being a tweaker, that was a disappointment.

But the sound even with stock tubes is very good, and the build quality and the quietness of the pre amp is hard to beat for the money.

Update.
I revisited tube rolling with my Eclipse.
A pair of NOS 5960 really did smooth things out and take a harsh edge off of what I had previously felt was decent sound.
I agree completely that better tubes (left side)make this an even better pre amp.
The RCA clear tops that I had tried (bought used)must have been sub standard or used up.