2N3055 is a silicon power transistor used mostly in amplifier and power supply circuits but it is designed for general–purpose switching and amplifier applications. 2N3055 transistor is packed in a TO-3 can, the maximum power rating is 115W, voltage 60V and 15 amp max with a beta gain of 20 to 70 at a collector current of 4A.


Its popularity is because it could dissipate 115W (full power) at a collector voltage of 60V and a collector current of 1.9A and still the case temperature did not exceeded 250C.

So much talking… Let’s begin to present you some of the most used 2n3055 amplifier circuits available on the internet! This article is full with schematics, designs and probably new amplifier concepts.



2N3055 stereo amplifier 100W

A great stereo amplifier built with 2 x 2N3055 and 2 x MJ2955 power transistors, we cannot tell you if it is an 2 x 100W stereo amp or 2 x 50W…
First lets see the schematic (or diagram…)
2n3055 stereo amp

Now lets look at the parts list

2n3055 stereo partlist

And finally the 2N3055 stereo amp pcb layout

2n3055-stereo-amp-pcb1
100w 2n3055 pcb

Wait, there’s more!