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This rare Amperex 6AS7G has black plates and a dual bottom getters. The red print on the base has the Amperex logo and reads "Made in Holland." Tube tests as new with low noise.
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The 1970s Sylvania 6550 power tubes in this matched pair have welded gray plates, 3 getters, and metal collar bases. The blue or green print on the glass has the PhilipsECG. Click "more info" for test restuls.
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The 1965 Amperex 6DJ8 / ECC88 tubes in this precisely matched pair have halo getters and silver risers. The white print has the HP logo and the Heerlen, Holland factory code is etched in the glass. Both tubes test as new with phono grade noise levels.
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This rare 1950s Arcturus 12AX7 tube has short black plates with copper grid posts and a D getter. The white print on the glass has the Arcturus logo. This tube appears new in box but it tests at about 80% for Gm on both sections. Phono grade noise levels.
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This 1950s military spec Bendix 5992 tube is a ruggedized 6V6GT tube type. It has black plates, triple micas with support rods, and dual D getters. The brown base has black print with the Bendix logo. Tube tests as new.
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This rare 1950 Cunningham 5Y3GT rectifier tube has smooth black plates and bottom D getters. The silver print on the glass has the Cunningham logo. Tube tests as new.
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The RCA 6BQ5 / EL84 tubes in this precisely matched pair have smoked glass, gray plates, and halo getters. The red print on the glass has the RCA logo. Tubes are matched for both current draw (mA) and transconductance (Gm).
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The early Sylvania 6BQ5 / EL84 tubes in this precisely matched pair have black plates and halo getters. The red and yellow labels have the Sylvania logo (partial). Both tubes test as new and are matched for current draw (43.3 & 45.3 mA) and Gm (92% & 95%)
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This 1965 Telefunken 6DJ8 / ECC88 tube was made in Berlin, West Germany. The white label has the Telefunken logo and the diamond imprint is in the glass between the pins. Tube tests as new with balanced sections and phono grade noise levels.
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The 1966 Westinhouse 7591 tubes in this precisely matched quad have gray plates and halo and side getters. The yellow print on the base has the Westinghouse logo. All 4 tubes test as new and are matched for both current draw (mA) and Gm.
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The 1967-69 RCA 5814A / 12AU7 tubes in this precisely matched pair are labeled for the broadcast quality RCA Command Series. They have black plates and halo getters. Both tubes test as new and are matched for both current draw (mA) and Gm.
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The ElectroHarmonix 6H30Pi tube is a super linear, military spec dual triode tube made in Russia. It has the same internal construction as the Sovtek 6H30Pi, except the EH 6H30Pi has gold pins and has been selected for tighter tolerances and lower noise.
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The 1950s Visseaux 6K6GT tubes in this precisely matched pair have black plates, bottom getters, and engraved bases. The white print on the glass says "Made in France." Both tubes test as new.
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TC Tubes specializes in precision testing and matching of vintage and new production vacuum tubes for guitar & bass players, audiophiles, and DIY tube audio enthusiasts. Our website features secure payment options and fast, convenient shipping around the world.
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