I don't think there are any revolutionary circuit designs today. Look thru the design manuals of the 30's and you will find every circuit configuration imaginable. Maybe the application of solid state regulation in power supply design is new and innovative. Certainly the improvement in resistor and cap technology has been revolutionary.
I remember the D76-A being a highly sought after amp, with wonderful mids and highs.
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System: ML:5206,5302 Serafino's Nordost Lumin U1 RM15
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