I'm considering buying the Spector USA preamp for my Euro4LX. It currently has the Tonepump, which just isn't doing it for me. Has anyone done this? Your thoughts, if so? I've read (and yes, I did a search) that the Spector USA 9-volt is, more or less, the old Hazlab pre. Is this true? Finally, I've also read that the pot holes in a Euro are too small for the pots of the USA version and require redrilling. Can someone tell me if this is the case? Thanks in advance.