For the output-transformer I used a Hammond 125B and for the power-transformer I used a toroidal transformer with secondary: 200V 0.1A and 6.3V 1.5A which I found HERE. The preamp is inspired by the Vox Night Train (which seems to be inspired by the Blues Express variant of the Trainwreck Express). In addition to that the use of a phase inverter feeding the ECC99 over a self-splitting ECC99 poweramp delivers more output and therefore more clean headroom. The two 12AX7s not only allow you to compensate the gain-loss of the tone stack and to use a PI but also provide you with an overall different sound and overdrive behavior than an amp with just one 12AX7 like the MiniAmp Number 1. ![]() The second 12AX7 here serves as a third gain-stage and a cathodyne phase inverter which feeds the ECC99 triodes with their phase inverted signals. This one now got two 12AX7s in the preamp and provides a tone stack with treble, middle and bass plus a volume control. ![]() The MiniAmp 2.0 was build by me because I loved how the MiniAmp Number 1 came out and so I wanted to build another little amp just a little bit different soundwise and a bit more versatile. ![]() It is an approximately 1.5W-2W guitar amplifier with an ECC99 push-pull poweramp. ![]() This time I want to show you my new MiniAmp 2.0.
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