So I finally got a Sovtek Mig 100. An ancient long lasting wet dream of mine. Don't ask why. Mojo, I guess and also maybe my Russian roots. It's all original, minus the switches and two power tubes were removed by the previous owner so it operates at 50w. All the other tubes are original and I must say it sound great and really unique as it is but I think changing 20+ years old tubes won't hurt. At least I want to take it back to 100w which involves using a brand new quad of 5881. I haven't been a huge fan of these tubes in the past so using 6L6 might be an option but I'm not sure I want to change its character too much. So I'm wondering what brand to look for when it comes to 5881? Maybe Soldano owners can chime in?