Yes the Mose Hercules II you have is supposed to be a bit of an improvement over be standard Internal Hercules II I’ve got. I’ve compared the internal Hercules I’ve got to the Valhalla and I’d say the tonality is v similar. The bass is a little more punchy on the Hercules and it’s maybe slightly less warm in the top end, but nothing like as much as the Lingo. The Hercules is a nice compromise and it’s good to get 45 RPM replay with an almost identical sound to the Valhalla without having the resort to the dreaded 45 RPM adaptor! I remember talking to Peter Swain on the phone once and he does indeed rate it.I use a Mose Hercules II, I thought it a step up from Valhalla, though it is I believe a clone of the Valhalla circuit, modified to provide 45 rpm and I think to reduce the drive to the motor a little, a bit like I understand the Lingo 1 does, to reduce motor noise.
Hard to know for me if it was moving the Valhalla out of the plinth or the small modifications to the Valhalla design in the Hercules, but the addition of 45 rpm is undeniable. Peter Swain likes the Hercules too. I think it is the bargain of the PSU options. On David's scoring, 24.9%, probably, though of course as a Naim user I shouldn't ever dare to Tune score anything
I’d say the older Valhalla without the Zener upgrade is nearly the same but has a bit less focus than the Zener version. It however is a bit more musical and slightly softer. That’s nice with some records.
I’ve also got a couple of original big red button Basik PSUs. Put one of those in and the sound loses quite a lot of detail compared to the Valhalla and the midbass is bigger. Sound is even warmer and less defined. It’s a bit bloated and quite off the pace compared to other options these days but it’s very musical though!
I really like the Valhalla and Hercules. They’ve kind of got a tonality and musicality in between the Basik and Lingo variants. Nice compromise. Anything drier and leaner sounding is no use for my 1980s thinner sounding LPs. The PSU choice does depend to some extent on what era of vinyl you are listening to. With more modern records I sometimes wish I had a Lingo or cirkus upgrade.