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The amplifier I have been using for the last few years
has a unity gain 1MHz
bandwidth class A push pull output stage, driven directly by a 150MHz current
feedback op-amp with no overall loop feedback. It was only recently however I tried
replacing the op-amp, connecting the no mercy valve pre-amp directly to the experimental output stage.
Now using the modified Philips CD player, the same active wire, the same speaker cables,
and the same speakers, the sound was absolutely breath taking... so clean, fast,
transparent, effortless. Noticeably better than the video op-amp I had been
using... The thing is, the valve pre amp has always been that good. Due to limitations
else where it was masked when I first evaluated it.
Everything seems to be compromised in some way. If a small but significant improvement is made some
where in a system, how can you tell if the rest of the system is compromised. It is a step by step process,
with many twists and turns.
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