(!!!) (SINGLE) 5751 Hitachi Japan glossy black ribbed plates triple mica double D getters 1960's (2.2/2.6ma)

1 low noise tube) 5751 Hitachi Japan glossy black ribbed plates triple mica D getter 1960 era

2.2ma Gm=1900

2.6ma Gm=2000

Good NOS Ma = 2-2.5ma

Good NOS Gm range = 1500-1600

Sweet, smooth, nice mids, quiet, musical.

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