Ckoffend,
FYI, I was discussing with Aesthetix regarding HT bypass a long time ago, and I vaguely remember it was 2k-4k hours (stock tubes)
. I think it is crazy to burn $600 worth of tubes on a tube-preamp when watching movies.
I'm just curious if the 10M will last 10k hours.
Currently I'm using Telefunken/Fishers R-plate for now; it looks like I can't afford the 10M ...the last pair were sold at $270 yesterday.
The 5751, as Jafox suggested, for some reason, went up to $225 on ebay yesterday.
I got some Ediswan for the 6922 position as per the recommendation of another A'goner, but I haven't tried them yet.
BTW did you play with the gain settings?
I find that the Calypso won't sing if coupled with a tough load (in my case, singled ended connection to Ayre V3).
Calypso is also quite sensitive to the powercord.
Happy listening.
K