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The late 1970s GE 6550A power tubes in this precision matched pair have gray plates, 3 getters, metal collar bases, and 188-5 factory code (Owensboro, Ky). Tubes matched for both current draw (43.4 mA & 44.4 mA) and transconductance (5800 & 5800 Gm).
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This Hickok TV-7 military tube tester is calibrated and in good cosmetic condition. The name plate is missing but the meter is labeled for a TV-7/U. The TV-7 tester is an excellent vintage tester with great supplemental data and support on-line.
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The 1998 Svetlana 6550C tubes in this matched quad (4) were made in St. Petersburg, Russia. The etched print on the glass has the Svetlana logo and OTK factory mark. All four tubes are matched for current draw (63.6-65.4 mA) and Gm (7000-7200) Gm.
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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 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 red print with the National 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 vintage Russian 6P14P-EV (6Π14Π-EB in Cyrillic script) tubes in this precisely matched quad are high-reliability EL84 / 6BQ5 type tubes. They have a higher maximum plate voltage and dissipation than standard 6BQ5 tubes. Tubes test as new.
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The late 1960s Siemens E83CC tubes in this precisely matched pair are premium quality 12AX7 / ECC83 tubes. They have gray plates and halo getters. The white labels has the Siemens logo. Both tubes test as new with phono / V1 grade noise levels.
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This rare 1954 Tung-Sol 6SL7GT has round plates and black glass. The white print on the base has the Tung-Sol logo. Tube tests as new with balanced sections and low noise.
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The 1940s Sylvania 2A3 tubes in this precisely matched pair have black plates and bottom getters. The green print on the bases has the early Sylvania leaf logo. Both tubes test as new and are matched for current draw (48.0-50.5 mA) & Gm (4880-5000).
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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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