Lovely Cube (Lehmann Clone) with Burson V6 Classic Opamp Upgrade

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Replaced the NE5532 in the headphone amplifier. Not an immediate difference noticeable to be honest but after several times swapping back and forth over a range of acoustic and classical tracks there is perhaps a perceptible if very subtle warmth to the V6 Classic. Listening done on Grado RS2e headphones.