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374A Western Electric black plate used/good 1960's (18-21ma) (3 in stock)
374A Western Electric black plate used/good/65-70% 1960's (13-17ma) (15 in stock)
374A Western Electric gray plate used/good 1960's (17.2ma)
3C31=C1B Electrons Inc. NJ Thyratron NOS
3D21WB MU USA NOS (0 in stock)
3E29=829B Ken Rad NOS 1940's (1 tube only - no pairs)
4-125A=4D21 Eimac used sold as-is good filament
4-400A=8438 Eimac
4-65A=8165
40KG6A=PL519 JAPAN branded RCA tall bottle clear top NOS (1 in stock)
41 Philco engraved base used/good 1930's (72/40)
41 Sylvania Philco NOS 1952 (75/40)
42 National Union like new 1950 era (29.5ma) (Gm like new)
42 Philco engraved base used/very good 1930's (32.5ma)
42 Philco used/good 1940's (30.8ma)
42 RCA used/good 1940's (27.2ma)
42 Sylvania engraved used good 1940's (30ma)
42 Tungsol used/good 1940's (27ma)
42 Tungsol used/good 1940's (30ma)
42 Tungsol used/good 1940's faded printing (33ma)
