This early 1950s CBS 6SN7GTB tube has early black plates and a bottom getter. The red print on the bases has the CBS logo. Tube tests as new with low noise.
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The 1958-60 CBS 6SN7GTB tubes in this precisely matched pair have black plates, short bottles, and side getters. The red print on the bases has the CBS logo. Both tubes test new with low noise.
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The 1955 GE 6SN7GTA tubes in this precisely matched pair have short bottles, gray plates with copper grid posts, and side horseshoe getters. Their black bases have white print with the GE logo. Both tubes test as new and are precisely matched.
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The 1950s GE 6SN7GTB tubes in this matched pair have side horseshoe getters and gray plates with copper grid posts. The print on the glass has the GE logo. Both tubes test as new with balanced sections and low noise.
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This 1959 Raytheon 6SN7GT has black plates with copper grid posts and support rods. The yellow print on the base has the Raytheon logo. Tube tests as new with balanced sections and very low noise.
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The 1956-57 RCA 6SN7GTA tubes in this precisely matched pair have short bottles, staggered black plates, and side D getters. The black bases have silver print with the RCA logo. Both tubes test as new with balanced sections and very low noise.
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This rare 1954 RCA 6SN7GTA tube has a short bottle, side D getter, and black plates with copper grid posts. The silver print on the base has the RCA logo. Tube tests as new with balanced sections and very low noise.
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The 1956 RCA 6SN7GTB tubes in this precisely matched pair have staggered black plates with copper grid posts and bottom D getters. The silver print on the bases has the RCA logo. Both tubes test as new with balanced sections and low noise.
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The 1963 RCA 6SN7GTB tubes in this precisely matched pair have bottom D getters, and staggered black plates with a filament across the top mica. The narrow black bases have red print with the RCA logo. Both tubes test as new with balanced sections.
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This 1950s Sylvania 6SN7GTA tube has a medium bottle, black plates, and a halo getter with lots of chrome flashing. The black base has green print with the Sylvania logo. Tube tests as new.
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The 1960s Sylvania 6SN7GTB tubes in this precisely matched pair have black plates and lots of chrome flashing. The yellow print on the bases has the Sylvania lightning logo. Both tubes test as new and are matched for both current draw (mA) and Gm.
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This 1960s Sylvania 6SN7GTB tube has a tall bottle, black plates, and a halo getter with lots of chrome flashing. The yellow print on the base has the Sylvania lightning logo. Tube tests as new with low noise.
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This 1960s Sylvania 6SN7GTB tube has a medium bottle, black plates, and a halo getter with lots of chrome flashing. The black base has yellow or green print with the Sylvania logo. Tube tests as new.
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This 1957 Tung-Sol 6SN7GTB tube has has a tall bottle, black plates, and a horseshoe getter. The black base has white print with the Zenith logo. Tube tests as new with very low noise.
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This 1963 Westinghouse 6SN7GTB tube has a disc getter and gray plates with copper grid posts. The yellow print on the base has the Westinghouse logo. Tube tests as new with balanced sections.
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