I'm just wondering if anyone has used alternate tubes in their Atma-Sphere amps and if so, what have been their impressions? Good or bad experiences qualify!
I'm surprised you haven't recieved any replies in 8-1/2 years.
I use the Russian Winged-C 6H13Ps in my M-60/3.3s. They sound quite good are are relatively inexpensive.
All the 'N7s are Tung-Sol oval-plates, the world's BEST sounding 'N7 ever made!!!!!!!!!!!!!!!!!!!