GrabCAD
Class A - submini tube amp
by GrabCAD
Last crawled date: 2 years ago
This is a tiny, all tube guitar amp. The design exists all over the web, but repackaged by me to fit into a Hammond 1590B housing. Output transformer is a Hammond 125A (3 watt, Fender Reverb replacement). The power to the tubes is provided by a switchmode circuit in boost mode. It steps up 12VDC input to about 170VDC.
The tubes are both 6021 dual triode subminature. There are 3 gain stages (the first 3 triodes) while the final triode is arranged in single-end topology, biased to 1W. This is plenty (surprisingly) loud for practice, and even recording. It will drive 8 ohm speaker load (try a Marshall 4 x 12 for something really cool, the amp is the same size as a distortion pedal!)
It is very crunchy, indeed does not have a clean setting, but the fun is at the other end of the gain spectrum.
Final note: this just the main packaging work I did in PTC Creo, in order to properly size everything and make drilling templates for the housing. I did the circuit design in Eagle, and had the boards fabricated at OSHPark.com.
I'll update it shortly with final edits and renderings....
The tubes are both 6021 dual triode subminature. There are 3 gain stages (the first 3 triodes) while the final triode is arranged in single-end topology, biased to 1W. This is plenty (surprisingly) loud for practice, and even recording. It will drive 8 ohm speaker load (try a Marshall 4 x 12 for something really cool, the amp is the same size as a distortion pedal!)
It is very crunchy, indeed does not have a clean setting, but the fun is at the other end of the gain spectrum.
Final note: this just the main packaging work I did in PTC Creo, in order to properly size everything and make drilling templates for the housing. I did the circuit design in Eagle, and had the boards fabricated at OSHPark.com.
I'll update it shortly with final edits and renderings....
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