I have managed to acquire quiet tubes and they work very well with the MP-1. You just need to invest in good tubes and buy them from reliable sources that test properly.
If you buy the crap from ebay you will end up with noise issues. Whilst these tubes could be quiet on other pre-amps they are not with the MP-1. the pre-amp is very sensitive thus you have to be careful how you set this up. Using good Tube Dampers, good Damping platform, good tubes. If all done well you will be rewarded with something that feels magical.
If you buy the crap from ebay you will end up with noise issues. Whilst these tubes could be quiet on other pre-amps they are not with the MP-1. the pre-amp is very sensitive thus you have to be careful how you set this up. Using good Tube Dampers, good Damping platform, good tubes. If all done well you will be rewarded with something that feels magical.