Just a little experience with Itai (President of Heaven11). I bought his personal demo unit BillieAmp. He said he had it tested, replaced the tubes, updated firmware before shipping. Being a demo (allegedly his personal amp), no 30-day trial but did come with a 1 year warranty.
The thing hummed like a dozen hummingbirds. And, only on one source (analog)…even if no source was connected. Send Itai a vid of the amp humming. He agreed it was bad. Sent it back. His staff couldn’t fix it.
Again, under warranty, but he could not fix it. Wouldn’t replace it. And, to rub salt in the wound, made me pay for shipping to get the amp back.
I tried different receptacles, tried an eliminator, tried another power cord, tried it with and without sources connected. Tried two different set of speakers. Tried different speaker wire sets. STILL HUMMED LOUDLY!
I paid him 5 figures for a paperweight. He won’t even honor the warranty!
I think he bends over backwards for the YouTube folks. But, a cash customer? I’m stuck. If you get one that works, great! If not? Too bad, so sad!
Buyer beware!