Ian writes – “Goal/purpose: Mr. E.Z. Tube is a cheap vacuum tube audio platform without the ‘iron’: no power transformer, no output transformer(s). A tube amplifier will typically have several heavy, expensive transformers: output transformers that protect speakers from high voltages in the tube, and power transformers that provide high voltage by rectifying mains (AC) power. Mr. E.Z. Tube eliminates both, but still uses popular high voltage tubes. Mr. E.Z. Tube is definitely not audiophile gear – it is a platform for learning about tubes (bias, output/input capacitors, etc) without making a huge upfront investment in ‘iron’. There are tons of tutorials on working with tubes, this is not one of them. This is a platform that helped me understand what the tutorials were talking about through hands-on experience.”Link.