jonathan c
Headphoneus Supremus
Other aural benefits from the HP8 capacitor upgrades, in my experience, are: lower 'noise floor', expanded 'dynamic range', 'clearer transients'. 

That’s normal. My V1/2s at the start were hell to change, but the clamps settled into it after sth like 5 tube rolls. V3 never gave any resistance.Question on tube fitting. My 2 larger tubes (apologies for the caveman description, I'm a tube noon) fit into their sockets with some expected resistance before being seated correctly. However my smaller single tube has no resistance on the way in, and seems to just sit in the socket. Is this normal or does that sound like it could be a loose socket?
OK great, thanks so much!That’s normal. My V1/2s at the start were hell to change, but the clamps settled into it after sth like 5 tube rolls. V3 never gave any resistance.
Bringing this thread back up again…with HP8 Signature, I truly enjoy Caldera Closed (B&W Ebony): on "L" impedance setting when "V1" tube is RCA 'black plate, triple mica' 12AX7; on "M" impedance setting when "V1" tube is NOS Telefunken 'smooth plate' 12AX7.