Thanks Cee_Tee for the prompt reply; about the volume, the amps seems very stressed when trying to drive the Sundara properly, no red lights no porotection, units doesn't even get passing warm, not hot at all . . . i can even touch the tube for about 6 to 10 seconds while operating for over an hour.
About the pin tube socket force: i ahve been a tube fan for over 20 years, had more than my share of tubed preamps, DAC's, Amplifiers Integrated.
an avid tube roller and used to the normal force especially in a new components with new sockets, this is a lot more force than i'm used to use, also i'm a little scared of tube rolling for this single 6922 as some f my 6922 types are very valuable, i have some pairs of CCA's, Amperex WHite Label 7308's and 6922's.
Also some real bugle boy 6DJ8's, you understand . . .
I can easily drive the Sundara with the headphone amp jack out of a iFi stereo 50 (on loan from a friend), and when reading the reviews of many people recommending the CTH+S for the Senn's HD650 and teh drops' own HD6XX, i've figured SUndaras 37 Ohm and 94dB/mW spec should be a walk in the park . . . boy I was wrong.
I need some help and don't know where to go, can you please point me in the right direction?
I simply can't use this amp like that.
Thanks for the help,