The power amp circuit is built using TIP35/36C transistor, the output stage is deliberately massive overkill. The figure is show the circuit;
The principle work and specification guitar power amplifier is power transistors will have an easy time driving any load down to 4 ohms. If you don't use the PCB, you can use TO3 transistors for the output stage. MJ15003/4 transistors are very high power, and will run cooler because of the TO-3 casing (lower thermal resistance). Beware of counterfeits though! There are many other high power transistors that can be used, and the amp is quite tolerant of substitutes (as long as their ratings are at least equal to the devices shown). The PCB can accommodate Toshiba or Motorola 150W flat-pack power transistors with relative ease, if you wanted to go that way. TIP3055/2966 or MJE3055/2955 can also be used for light or ordinary duty.
The principle work and specification guitar power amplifier is power transistors will have an easy time driving any load down to 4 ohms. If you don't use the PCB, you can use TO3 transistors for the output stage. MJ15003/4 transistors are very high power, and will run cooler because of the TO-3 casing (lower thermal resistance). Beware of counterfeits though! There are many other high power transistors that can be used, and the amp is quite tolerant of substitutes (as long as their ratings are at least equal to the devices shown). The PCB can accommodate Toshiba or Motorola 150W flat-pack power transistors with relative ease, if you wanted to go that way. TIP3055/2966 or MJE3055/2955 can also be used for light or ordinary duty.
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