DIY Discrete Solid State Guitar Amp

[Kaz Kylheku]

Also, this schematic has no short circuit protection so shorting the output could damage the output transistors. I have newer versions but they are a little more complicated.

Have you thought about a dual supply version, DC coupled to speaker?

[Loudthud]

Have you thought about a dual supply version, DC coupled to speaker?

It's the simplicity of a single Voltage gain stage without global feedback that makes the amp sound more like a tube amp. Cap coupled outputs just sound better. DC coupled outputs are why transistor amps sound bad.

MEF is back. Check this thread:
https://music-electronics-forum.com/forum/amplification/guitar-amps/theory-design/49294-

[Loudthud]

I forgot to mention: There are 48V power supplies that can be used to power a 59W @ 4 Ohm guitar amp.

Example: https://www.jameco.com/z/PSA120U-480L6-R-Phihong-120W-48VDC-Output-Desktop-With-C14-Inlet-and-4-Pin-Din-Connector_2670879.html

Some have a barrel connector like used on effects pedals. I'd stay away from those because you don't want to plug 48V into a 9V stompbox by mistake Choose one with the 4 pin DIN connector. Most have a Universal Mains input so it can be plugged in anywhere on earth. All you need is the right Mains cord for wherever you are. The minus side of the 48V is usually connected to the Mains safety ground inside the brick. For a 50W amp you need something like 125W power supply.