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Genalex Gold Lion KT66 reissue - premium matched
Genalex Gold Lion KT66 reissue - precision matched
Price: $47.00
Sale Price: $37.60
Genalex Gold Lion KT66 reissue - precision matched
These new production Genalex Gold Lion KT66 power tubes can be run in any amp that uses 6L6 or 5881 type tubes. They are a faithful reproduction of the tubes used in Clapton's Bluesbreaker amp and popular Heathkit and Leak hi-fi amps from the 1960s.
on sale
Sylvania 6550 - welded plates
Sylvania 6550 - matched pair
Price: $214.00
Sylvania 6550 - matched pair
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.
RCA 5691 - red base, matched pair
RCA 5691 - red base, matched pair
Price: $189.00
RCA 5691 - red base, matched pair
The 1961 RCA 5691 tubes in this precisely matched pair are a premium 6SL7 tube type. They have short bottles, distinctive red bases, triple micas and 11 support rods. The are labeled for GE. Both tubes test as new with balanced sections.
Amperex 12AX7 / ECC83 - Bugle Boy label, phono grade
Amperex 12AX7 / ECC83 - Bugle Boy label, phono grade
Price: $109.00
Amperex 12AX7 / ECC83 - Bugle Boy label, phono grade
This 1964 Amperex Bugle Boy 12AX7 / ECC83 tube has gray plates and a halo getter (I65 series). It has the famous Bugle Boy label. The Heerlen, Holland factory code is etched in the glass. Tube tests as new with phono/V1 grade noise levels.
Cunningham 5Y3GT - black plates
Cunningham 5Y3GT - black plates
Price: $44.00
Cunningham 5Y3GT - black plates
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.
GE 5-star 12AY7 / 6072A - black plates
GE 5-star 12AY7 / 6072A - black plates
Price: $97.00
GE 5-star 12AY7 / 6072A - black plates
This 1960s GE 6072A is a military spec 12AY7 tube type. It has black plates, support rods, and a disc getter. The white print on the glass has the GE logo with the 5-star broadcast quality label. Tube tests as new.
GE 7247 / 12DW7 - matched pair
GE 7247 / 12DW7 - matched pair
Price: $84.00
GE 7247 / 12DW7 - matched pair
The 1960s GE 7247 tubes in this precisely matched pair are high reliability 12DW7 preamp tubes. They have ribbed gray plates and halo getters. The white print on the glass has the GE logo. Both tubes test as new with low noise.
Mullard 12AX7 / ECC83 - matched pair, I61 series
Mullard 12AX7 / ECC83 - matched pair, I61 series, phono grade
Price: $194.00
Mullard 12AX7 / ECC83 - matched pair, I61 series, phono grade
The 1963 Mullard 12AX7 / ECC83 tubes in this precisely matched pair have gray plates with copper grid posts (I61 series). They are labeled for 3M and the Blackburn, UK factory codes are etched in the glass. Click "more info" for details.
Mullard EF86 / 6267 - mesh plate, early D getter
Mullard EF86 / 6267 - mesh plate, early D getter
Price: $94.00
Mullard EF86 / 6267 - mesh plate, early D getter
This 1958 Mullard EF86 / 6267 tube has mesh plates and a D getter. The white label has the Mullard shield logo and "Made in Gt. Britain" is printed along the bottom. The Blackburn, UK factory code is etched in the glass. Tube tests as new.
RCA 12AT7 - gray plates, matched pair
RCA 12AT7 - gray plates, matched pair
Price: $89.00
RCA 12AT7 - gray plates, matched pair
The 1960s RCA 12AT7 tubes in this precisely matched pair have gray wing plates and halo getters. The red labels have the RCA logo. Both tubes test as new with very low noise.
RCA 12AX7 - long black plates
RCA 12AX7 - long black plates
Price: $149.00
RCA 12AX7 - long black plates
This 1955 RCA 12AX7 tube has long black plates and a slanted D getter. The white print on the glass has the RCA logo. Tube tests as new with balanced sections and phono grade noise levels.
RCA 6FQ7 / 6CG7 - side getter, matched quad
Price: $224.00
RCA 6FQ7 / 6CG7 - side getter, matched quad
The 1971 RCA 6FQ7 / 6CG7 tubes in this precisely matched quad have gray plates, side getters, and clear tops. The red print on the glass has the RCA logo (may be partial). Both tubes test as new with balanced sections.
RCA 6L6GC - matched pair
RCA 6L6GC - matched pair
Price: $224.00
RCA 6L6GC - matched pair
The 1963-64 RCA 6L6GC power tubes in this precisely matched pair have black plates and side O getters. The red print on the bases has the RCA logo. Both tubes test as new. They are matched for current draw (58.2 & 60.0 mA) and Gm (96% & 100%).
RCA 6V6GT - gray glass, matched pair
RCA 6V6GT - gray glass, matched pair
Price: $114.00
RCA 6V6GT - gray glass, matched pair
The 1954 RCA 6V6GT tubes in this precisely matched pair have gray glass and bottom D getters. Their black bases have silver print with the RCA logo. Both tubes test as new and are matched for both current draw (mA) and Gm.
Sylvania 6BQ5 / EL84 - black plates, matched pair
Sylvania 6BQ5 / EL84 - black plates, matched pair
Price: $109.00
Sylvania 6BQ5 / EL84 - black plates, matched pair
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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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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