The 1959-60 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 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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The 1962-63 GE 6SN7GTB tubes in this precisely matched pair have side O getters and gray plates with copper posts. The white print on the base has the GE logo. Both tubes test as new with balanced sections and low noise.
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These very rare 1960s Mullard 6SN7GTA tubes were made in Australia. They have medium bottles with the white Mullard shield logo, black plates, and bottom getters. Tubes test as new with very low noise.
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This 1954 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 1950s RCA 6SN7GT 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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This rare 1955 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 1958 RCA 6SN7GTB tubes in this precisely matched pair have staggered black plates 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 1964 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 rare 1945 RCA VT-231 is a military spec 6SN7GT. It has a medium bottle with gray glass and staggered black plates. The silver print on the base has the RCA logo and reads "JAN-CRC-6SN7-GT VT-231." Tube tests as new with balanced sections.
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This 1950 Sylvania 6SN7GT tube is from the "Bad Boy" era of Sylvania 6SN7 production. The early black plates have 3 rivets with copper grid posts. The yellow print on the base has the Motorola logo. Tube tests as new with low noise.
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This 1951 Sylvania 6SN7GT tube has ladder-style black plates with copper grid posts and bottom D getters with lots of flashing. The green print on the base has the Sylvania lightning logo. Tube tests as new with low noise.
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The 1951 Sylvania 6SN7GT tubes in this precisely matched pair have ladder-style black plates with copper grid posts and bottom D getters with lots of flashing. The green print on the bases has the Sylvania lighting logo. Both tubes test as new.
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The 1950s Sylvania 6SN7GTA tubes in this precisely matched pair have black plates and halo getters with lots of chrome flashing. The thick black bases have green print with the old Sylvania lightning logo. Both tubes test 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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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 early 1950s military spec Sylvania 6SN7W has a short bottle and a top getter with lots of chrome flashing. The early black plates have 2 rivets and an extra support rod. The green print on the base has the Sylvania lightning logo. Tube tests as new.
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This 1957 military spec Sylvania 6SN7WGT has a short bottle, early black plates, an extra support rod, and a nice chrome dome. The white print on the brown base reads "JAN-CHS-6SN7WGT." Tube tests as new with balanced sections and low noise.
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This rare 1956 Tung-Sol 6SN7GT tube has gray glass with bottom getters. The white print on the base has the Tung-Sol logo. Tube tests as new with balanced sections.
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This 1960s Westinghouse 6SN7GTB tube has black plates with copper grid posts and a halo getter. The yellow print on the base has the Westinghouse logo. Tube tests as new with balanced sections.
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