Class A GE 5670 tube valve preamplifier preamp amplifier include transformer 110V Test video linker: http://www.youtube.com/watch?v=SVwSbe_duCk A pure valve preamplifier, make sound more warm. Package GE5670 valve. sound is better then 6N3, AudiophilerMKP pro audiocoupling capacitor.andnichicon filtering capacitance Using E-package USPS post shipping to USA,UK,AU. usually 7-12 business days arrival ,not accept ship to other country yet. please do not buy it if you aren't the list buyer.