Manley 300B Neo Classic Preamp owners

Why did I not know this?  I just discovered the switch atop the unit marked Output Direct/Transformer actually has a function.  Manley in their literature suggests Output Direct for purer listening.  Well duh....  The unit second hand came in the Transformer setting and I never thought about it.  Go ahead and collectively laugh now.  Anyway, palpable change and improvement.  Hurray for me!  Cheers