Boutique amp builders are becoming more and more common and, generally speaking, frequently do not disappoint.  Information on 3rd Rail is pretty scarce, but this little Harvard style combo is a lot of fun to play. At 10 Watts, the 10" alnico speaker has just a touch of give on some of the heavier transients when the amp is working hard. A modified circuit, the 12ax7 (as opposed to the 6AT6 of the original design) is run in "dual triode" which yields a bit more front end gain. Other add-ons include the inclusion of a "NFB" (negative feedback) switch to yield a cleaner or more mid-heavy tone, a "Low Cut" control to help tame some of the beefier signature tweed bass tones, a "Cut" control, not unlike that of a Vox, and a "Bump" control, which adds more midrange, usually assisting in earlier breakup.  While this amp doesn't have a Master Volume control, the low output and impressive array of features helps a player tailor their sound and indulge in the creamy goodness of natural tube distortion. In nearly "mint" condition, this amp would make the perfect addition to any arsenal at a great price.