This was made in year 2006. This is a simple version as I only do the pre-amp part and there is no input selector, remote control and volume control. I use a ladder type step volume control for each channel. The resistors are just normal 1% metal film resistors.
The sound is very smooth for this pre-amp but it lack the extension in super high frequency.
This was the biggest amplifier I ever made so far. It weights more than 35kg each mono block. I use total 1kV transformer and 3 big heat sinks for each block. This give me about 100W pure class A and the bass strength is just super! It is also very hot and consume about 300W power for each block. Unfortunately the sound for mid and high frequency is not very smooth but it is great to drive low frequency speaker.
This was built in 2004. I made two mono blocks and each use 625VA transformer. It is my first Nelson Pass power amplifier and after that I trust all the Pass design is better than most other amplifiers selling in the market. Sometimes, I am still using this power amplifier in 2009.
I remember it is a very hot pre-amp! That was made in April 2004.
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