Nelson Pass Aleph P
My brother and I have build two Nelson Pass Aleph P Class A preamplifiers, and we are very pleased with the sound. The preamp is controlled by a PIC18F4620 micro controller.
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The new attenuator pcb bottom side. Please note that the photo is showing version 2. We had to multiply all component values by 10 to reduce the load on the Aleph P preamp.
The electronic files