Breathed upon music angel 300B amplifier - New mains transformer, an improved heater supply circuit in a remote box on a removable 500mm umbilical cord plus some beefy valve set up meters. This item would not get CE approved as there are three open holes in the rear where RCA’s once were.
I have owned it for around four years and it has never given a problem. I run the valves at 60 mA
£400 collected from devon