I recently purchased an M80 mic pre but have not yet received it. What should I expect? this is a used unit with the "Jensen" transformers. Is this a pretty good pre for general purpose. I'm tracking through my D8B right now. Will it be much of an improvement? I also ordered an RME AD8 Pro to use as converters. I would also like some feedback on True Systems Precison 8. Thanks to all Abraham.