With respect to KR 300's, I would only buy brand new and from an authorized dealer that offers a warrantee.
KR had reliability issues in the past in which KR stopped offering warrantee replacements, therefore, forcing some tube amp manufacture to look for another high quality 300B tubes for their amps. For the asking price of a pair of new KR 300, why bother when you can get a pair of Emission Labs.
KR had reliability issues in the past in which KR stopped offering warrantee replacements, therefore, forcing some tube amp manufacture to look for another high quality 300B tubes for their amps. For the asking price of a pair of new KR 300, why bother when you can get a pair of Emission Labs.