ARC has strict QC for tubes and tube matching and I suspect they prefer no aftermarket supply over a loosening of standards for tubes going into production components.
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Wilson Alexia V; ARC Ref 6SE; ARC Ref Phono 3SE; Boulder 1160; Esoteric K1X; Artisan Fidelity Garrard 301 Statement; Ikeda 407; Koetsu Leopard, Coralstone; Shunyata Denali 6000T; Shunyata AC cables; Siltech Prince speaker cables; Siltech Princess interconnects, Avondale II phono.
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