Class A - submini tube amp

grabcad

This compact guitar amp features an all-tube design housed within a Hammond 1590B casing. The Hammond 125A output transformer (3-watt Fender Reverb replacement) powers the amplifier, while a switchmode circuit in boost mode provides power to the tubes by increasing the 12VDC input voltage to approximately 170VDC. The amp employs two 6021 dual triode subminature tubes and includes three gain stages using the first three triodes, with the final triode arranged in single-end topology for a 1W output. Ideal for practice or recording sessions, this amp can drive an 8 ohm speaker load; consider pairing it with a Marshall 4x12 cabinet for enhanced sound. Despite its lack of clean settings, the amp delivers a crunchy tone that's sure to impress. The packaging design was done in PTC Creo, while the circuit layout was created using Eagle and fabricated by OSHPark.com. Stay tuned for final edits and renderings soon!