My standard Leak Stereo 20s performance is very good but not at the leading edge of performance. Compared to my other full on leak, its not in the race. I am saying if you what your leak to perform you must rebuild it with the right weapons, that includes removing all the electrolytic capacitors, I used PB Solens, and VSF Duelunds, they are very good in the leak. Replacing the resistors with the right resistors, a combination of Allen Bradleys, Shinkoh, audionotes, all 2 Watt, then critically you must put them into the right spots. The standard wiring is OK but it looks to be tin plated solid core. The leak will sound even better if all the wiring is replaced with Cat 5 solid core copper in a Teflon sleeve, (remove the cat 5s plastic coating). Also you need great tubes, In my leak the first tube vintage German Siemens 5814A / 12Au7, second tubes two vintage English Mullard long plate 12AX7s, Power tubes are vintage English Mullard EL84s with hole in plate with 1950-60s date codes or German Telefunken EL84s. Against all my other push pull amps, Including Mullard EL34 base amps, a pair of Quad 2 GEC KT66 mono amp and many more, the leak is supreme. The leak is not perfect, the main drawbacks include low power and they can have weak bass, but after modifying very good. I am very tempted to change it to triode mode and knowing how crazy we audiophiles are, probably will. PS PB Solens can sound ordinary in many HI FI applications, the trick is to understand how and where to use them. In the right spot, superb.