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The GE 6L6GC power tubes in this premium matched quad have gray plates, dual side getters, black bases, and the 188-5 factory code (Owensboro, Ky). Tubes test as new and are precisely matched for both current draw (mA) and transconductance (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 2001 SED "Winged C" 6550C tubes in this precisely matched quad (4) were made in St. Petersburg, Russia. The etched print on the glass has the =C= logo and OTK factory mark. Tubes test higher than spec; recommended for fixed bias amps.
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This military spec 1956 Tung-Sol 5998 is an uprated 6AS7G/6080 dual triode tube type. It has black "domino" plates and a top mica with 3 spacers. The Tung-Sol logo is printed on the base and reads "JAN-CTL-5998." Tube tests as new with very low noise.
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The GE 7044 tubes in this precisely matched pair have halo getters and gray plates with copper grid posts. The green print on the glass has the GE logo. Both tubes test as new and are matched for both current draw (mA) and Gm.
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The 1951 military spec 5692 tubes in this precisely matched pair are an industrial grade 6SN7 tube type--and an audiophile favorite. They have distinctive red bases, triple micas and 11 support rods. Both tubes test as new. Click "more info" for details.
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The early 1970s Mullard 12AT7 tubes in this precisely matched pair have gray plates and halo getters (VF3 series). They have the Amperex logo and the Blackburn, UK factory codes are etched in the glass. Both tubes test as new.
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The rare 1952 military spec National Union 6SL7GT tubes in this precisely matched pair have bottom D getters and black glass. The silver print on the base has the National Union logo and reads "JAN-CNU-6SL7GT." Both tubes test as new with low noise.
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The 1960s Philips 6V6GT tubes in this precisely matched pair have brown bases, gray plates, and halo getters with lots of flashing. The yellow print on the glass has the Philips logo and "6V6GTY U.S.A." is etched in the glass. Tubes test as new.
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The 1965-67 RCA 6FQ7 / 6CG7 tubes in this precisely matched pair have gray plates, side getters, and clear tops. The red print on the glass has the RCA logo. Both tubes test as new with balanced sections.
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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 military spec Sylvania 12AX7 tubes in this precisely matched pair have gray plates with copper grid posts and halo getters. The blue or green labels have the PhilipsECG logo and read "JAN 12AX7WA." Both tubes tests as new with phono grade noise levels
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This unusual 1961 military spec Tung-Sol 12AY7 tube has short gray plates and a halo getter. The white print on the glass has the Tung-Sol logo and reads "JAN-12AY7." Tube tests as new with balanced sections and very low noise.
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This rare 1960s Westinghouse 6V6GTA tube has heavy duty 7591 style plates with copper grid posts and a horseshoe getter. The yellow print on the base has the Westinghouse logo. Tube tests as new with low noise.
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This 1961 Amperex 6922 / E88CC tube was made in USA (New York factory code) and has the PQ label, indicating that it was selected for special quality. It has gold pins and a large O getter. Tube tests as new with phono grade noise levels.
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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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