Does anyone know if the 6AR6 is a compatible tube (with adapter of course) in the Torii mkIV. I tried some Tung Sol 6AR6s and they seemed to run a little hotter than the usual tubes but sounded good. I got nervous and pulled them after about 5 minutes because I realized I could be damaging the amp or tubes or both.  

Ratings

Vh      Ih      VaMax      Vg2Max      PaMax      Pg2Max      Cgk      Cak      
6.3      1.2      630                 315         21                 3.5      11.0      7.0      

Cga
0.8

Application

Class      Va      Vg2       Vg1         Ia              Ig2      Ra             S
A             300      300      -36.0 . 58.0      4.0      22,000 .   4.3