Made in USA by Tung-Sol.
Black glass. Muddy black plate. Bottom Pan-Getter.
Great type from 6B4G family.
Very good bandwidth, bass, midrange and soundstage.
Nos in original box. 2 pairs are available.
Made in USA by Sylvania (1940s).
Muddy black plate. Bottom Pan-Getter.
Very nice tube. Sweet and balance sounding.
Nos but no original box. All tested very strong.
Matched pair and quad are available.