WNA MKl without input / output caps and OPA228 (amp) AD744 (Rail Splitter)
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Barebones MKl WNA headphone amplifier fitted with OPA228 opamps instead of the stock LM6171. This dispenses with the input / output caps / trimpots etc. (which are necessary if using the LM6171) and sounds a hell of a lot better without them contaminating the signal path (to my ears) .