There's a thread either here or on the asylum that mentions the user keep the IO on 24/7 for a year. The tubes were down 5 to 15% after that time. That amounts to a long time for the typical user. If I remember correctly, they were NOS tubes, not stock.
Speaking of the stock tubes, I'm not a fan at all. If forced to live with the Sovtek's, I would sell the IO and find something different. Just a different opinion from the two above.
Speaking of the stock tubes, I'm not a fan at all. If forced to live with the Sovtek's, I would sell the IO and find something different. Just a different opinion from the two above.