From my
Post #61,629:
"HiFiMan Sundara & HE400i from open box sale arrived.
Sundara replaces the HE 560 v2 balanced into the Mjolinar 2 from Gungnir MB Unison -> iMac (ripped Apple Lossless) stack.
Mjolinar 2 running ECC88 Mullard - Blackburn - White Logo - June 1961; HE 560 & Sundara are very nice from them.
However - Rolling time again.
Rolled to adapted 396A Western Electric - NOS - 1976. Previously the Western Electric, had been the front pair in Valhalla 2; worked nicely with Sennheiser HD650.
In the Mjolinar 2 they sucked the life out of the Sundara.
Now 6N23P Voskhod Rocket - 1971; Sundara back alive again, rivals the ECC88 Mullard.
Going to stay here a bit to determine if it is a keeper setup."
I also have Beyerdynamic T1v2 and Sennheiser HD650 which I run ballanced from the Mjolinar 2. The T1 and HiFiMan seem to like the same tubes. I use different tubes for the Sennheiser.
I also have a Jotunheim running single ended from the Gungnir MB. It is a great amp. With the mentioned headphones, in this system, I prefer the Mjolinar 2.
A Cambridge CXC CD spinner is an alternate source for the Gungnir MB. Same conclusions.
JMTC & YMMV