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The new old stock St. Petersburg 6550B power tube is the predecessor to the new production SED "Winged C" 6550C tube. Same great quality at a great value!
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The Type II Ei KT90 power tubes in this precision matched quad were made in the former Yugoslavia. They have welded gray plates and dual O getters. Tubes test as new and are precisely matched for both current draw (mA) and transconductance (Gm).
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The GE 6L6GC power tubes in this premium matched pair have gray plates, dual side getters, and black bases. They also have matching date codes and the 188-5 factory code (Owensboro, Ky). Tubes test as new and are precisely matched.
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This new old stock 6550B power tube is the predecessor to the highly regarded current production SED Winged C 6550C tube made in St. Petersburg, Russia. Same great quality at a much lower price! Price includes extended burn-in and precision matching.
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The Brimar 12AU7 / ECC82 tubes in this precisely matched pair were made in Great Britain. The white labels have the Mullard IEC logo. Both tubes test as new with balanced sections and very low noise. They are matched for both current draw (mA) and Gm.
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The 1970s GE 6FQ7 / 6CG7 tubes in this precisely matched quad have halo getters and gray plates with copper grid posts. The white labels have the GE logo. All 4 tubes test as new and are matched for both mA and Gm.
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The Matsushita 12AX7 / ECC83 tubes in this precisely matched pair were made in Japan. They have Mullard-syle gray plates and halo getters. Both tubes test as new with high gain and balanced sections. They are matched for both Gm and current draw (mA).
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The unusual 1968 Mullard 12AX7 / ECC83 tubes in this precisely matched pair were made in Great Britain (I63 series) and have gray plates and halo getters. They have the Telefunken logo and Mullard's Blackburn, UK factory code. Both tubes test as new.
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Price: From $104.00 to $112.00
This 1955-56 military spec RCA 12AX7 tube has long black plates and a D getter. The white label on the glass reads "JRC-12AX7." These RCA black plates are getting hard to find--grab one while supplies last! Click "more info" for current availability.
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The 1970s RCA 6V6GTA tubes in this precisely matched pair have gray plates and bottom O getters. The red print on the bases has the RCA logo. Both tubes test as new and are matched for both current draw (mA) and transconductance (Gm).
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The 1956 military spec Sylvania 6SN7WGT tubes in this precisely matched pair have short bottles, brown bases, top getters with lots of chrome flashing, and early black plates with 3 rivets Both tubes test as new and are precisely matched.
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The 1960s Telefunken 12AU7 / ECC82 tubes in this precisely matched pair have ribbed plates and halo getters. The diamond imprint is stamped in the base of each tube. Both tubes test as new with very low noise and are matched for both Gm and mA.
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This 1961 military spec Tung-Sol 6X4 rectifier tube has black "X" style plates and dual D getters. The yellow label has the Tung-Sol logo and reads "JTL-6X4W." Tube tests as new.
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The 1970s RCA 7025 tubes in this precisely matched pair are low noise 12AX7 / ECC83 tube types. They have short gray plates and halo getters. The red labels have the RCA logo and say made in Mexico. Both tubes test as new with high gain and low noise.
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Price: From $144.00 to $319.00
The 1960s Amperex 7308 tubes in this precisely matched pair are premium quality 6DJ8 / ECC88 tubes (VR5 series). They have gold pins, gray risers, and large O getters. Both tubes test as new with phono grade sound quality. Click "more info" for details.
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The 1930s RCA 45 triode tubes in this precisely matched pair have ST bottles and bottom dish getters. The engraved bases read "RCA Cunningham Radiotron." Both tubes test as new and are matched for both current draw (28.8 mA & 28.4 mA) and Gm.
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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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