Which model Sophia 845 tubes did you purchase? Some of the 845 tubes that Sophia sells do not conform to the RCA/Amperex 845 operating standard, therefore, you could be using an 845 tube not spec'd for your amp.
Best suitable 845 Tubes for NAF 845 SE
I am using New Audio Frontiers 845 SE, even they sound good smooth BUT I am sick and tired of facing blowing Sophia Tubes after every 6 to 8 months. I had free replacement from them for more than 3 times, but I am really really tired. I am seeking for permanent solution.
I really can use a good advise of which 845 tubes available in the market are MOST suitable for NAF 845 SE for most permanent solution.
Thank you for your kind help in advanced,
Most sincere regards
I really can use a good advise of which 845 tubes available in the market are MOST suitable for NAF 845 SE for most permanent solution.
Thank you for your kind help in advanced,
Most sincere regards