DoomTrain
Posted: Thu Mar 28, 2013 5:22 pm
DoomTrain
The DoomTrain is an 18W amp which comprised of a Matamp GT120 and Trainwreck Express running 2 El84s at 18W or so in cathode bias. There are 2 inputs, 1 for the Matamp GT120 preamp and 1 for the Trainwreck Preamp. The 2 preamps are passively mixed together before the phase inverter and power amp (modeled after a GT120) Controls were simplified to Tone, and Volume for Matamp side, and Tone, Shift and Volume for the Trainwreck side along with a PPIMV style master volume. The tone controls take the general Bass and Treble controls and put them in 1 dual pot. The phase switch refers to how the Tone control operates. In normal phase, when the Tone is increased, this is akin to increasing bass and treble together where as in out of phase mode, the Bass and Treble operate inversely where turning up the Tone results in Bass going up and Treble going down. Likewies if you turn down the Tone, Treble increases and Bass decreases.
Current Status of This Amp: Electrically Complete and Delivered to Customer who will build headshell for himself.
[youtube]http://www.youtube.com/watch?v=K9EibSNsq7U[/youtube]
[youtube]http://www.youtube.com/watch?v=1ZOUBumRv9s[/youtube]
The DoomTrain is an 18W amp which comprised of a Matamp GT120 and Trainwreck Express running 2 El84s at 18W or so in cathode bias. There are 2 inputs, 1 for the Matamp GT120 preamp and 1 for the Trainwreck Preamp. The 2 preamps are passively mixed together before the phase inverter and power amp (modeled after a GT120) Controls were simplified to Tone, and Volume for Matamp side, and Tone, Shift and Volume for the Trainwreck side along with a PPIMV style master volume. The tone controls take the general Bass and Treble controls and put them in 1 dual pot. The phase switch refers to how the Tone control operates. In normal phase, when the Tone is increased, this is akin to increasing bass and treble together where as in out of phase mode, the Bass and Treble operate inversely where turning up the Tone results in Bass going up and Treble going down. Likewies if you turn down the Tone, Treble increases and Bass decreases.
Current Status of This Amp: Electrically Complete and Delivered to Customer who will build headshell for himself.
[youtube]http://www.youtube.com/watch?v=K9EibSNsq7U[/youtube]
[youtube]http://www.youtube.com/watch?v=1ZOUBumRv9s[/youtube]
