5AS4A Westinghouse “”D”” getter halo 1960-1965 (58/40 and 58/50)

5AS4A Westinghouse “”D”” getter halo 1960-1965

58/40

58/40

5AS4 / 5AS4A Full-Wave Rectifier
(Higher Max DC output current and peak current per plate than 5AR4,
but 5AS4 is directly heated, recommended as an upgrade for a 5U4GB)

– Sun Audio SV300B-MKII
– Meixing Ming Da mc-7r 2006 pre
– Audio Note Mono amps


SONIC COMMENTS:

5AS4, as you described, seemed to open up the soundstage and improved the headroom, more macro-dynamic, just seemed to be stronger and more forceful. Bass was significantly more extended and detailed at
the same time. Tonal balance was still even, despite improved bass, suggesting to me my previous rectifier tube was not as extended.