High End HIFI /1:1 fa riferimento al circuito McIntosh C22, preamplificatore per tubo elettronico febbre, amplificatore MC Phono MM, tubo 12 ax7 12 at7/con telecomando - AliExpress
McIntosh: Home Audio Systems for Music & Home Theater
McIntosh C32 Preamplifier — HiFi Roma
Vancouver 2015: Hi Fi Centre and McIntosh Labs - Part-Time Audiophile