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Genalex Gold Lion KT66 reissue - premium matched
Genalex Gold Lion KT66 reissue - precision matched
Price: $52.00
Sale Price: $41.60
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.
GE 5-star 5687 - black plates, halo getter
GE 5-star 5687 - black plates, halo getter
Price: $32.00
GE 5-star 5687 - black plates, halo getter
This 1960s GE 5687WB is a military spec 5687 tube. It has black plates with copper grid posts and a halo getter. The white print has the GE logo with the broadcast quality 5-star label. Tube tests as new with balanced sections and low noise
Brimar 12AX7 / CV4004 - matched pair
Brimar 12AX7 / CV4004 - matched pair, phono grade
Price: $197.00
Brimar 12AX7 / CV4004 - matched pair, phono grade
The 1960s Brimar CV4004 tubes in this precisely matched pair are mil spec 12AX7 tubes made in Great Britain. They have long narrow plates and halo getters. The white print on the glass has the Brimar logo. Both tubes test as new with phono grade noise.
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 12AY7 / JAN-6072A - black plates
GE 12AY7 / JAN-6072A - black plates, phono grade
Price: $69.00
GE 12AY7 / JAN-6072A - black plates, phono grade
This GE 6072A tube is a military spec 12AY7 type tube. It has black plates with support rods and a disc getter. The label on the glass is missing and 6072A is etched in the glass. Tube tests as new with balanced sections and phono grade noise levels.
Genalex KT66 - gray glass, matched pair
Genalex KT66 - gray glass, matched pair 1
Price: $324.00
Genalex KT66 - gray glass, matched pair 1
The Genalex KT66 power tubes in this precisely matched pair have gray glass, bottom getters, and brown bases. They are matched for both current draw (64.0 mA & 64.0 mA) and transconductance (111% & 111% Gm).
Mullard 12AU7 / ECC82 - long plates, k61 series
Mullard 12AU7 / ECC82 - long plates, k61 series
Price: $92.00
Mullard 12AU7 / ECC82 - long plates, k61 series
This rare 1958 Mullard 12AU7 / ECC82 has long plates and a dual post halo getter (k61 series). The early Mullard shield logo is partial and the Blackburn, UK factory code is etched in the glass. Tube tests as new with phono grade noise levels.
Mullard EF86 / 6267 - mesh plate, early D getter
Mullard EF86 / 6267 - mesh plate, early D getter
Price: $89.00
Mullard EF86 / 6267 - mesh plate, early D getter
This rare 1955 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.
Philips Miniwatt 12AU7 / ECC82 - premium matched pair
Philips Miniwatt 12AU7 / ECC82 - matched pair
Price: $114.00
Philips Miniwatt 12AU7 / ECC82 - matched pair
The 1965 Philips Miniwatt 12AU7 / ECC82 tubes in this precisely matched pair have gray plates and halo getters. The Heerlen, Holland factory code is etched in the glass. Both tubes tests as new with balanced sections and very low noise.
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 1
Price: $224.00
RCA 6L6GC - matched pair 1
The 1960s 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 both current draw (61.4 mA & 63.4 mA) Gm (96% & 96%).
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.
RCA 6V6GTA - clear glass, matched quad
RCA 6V6GTA - clear glass, matched quad
Price: $197.00
RCA 6V6GTA - clear glass, matched quad
The 1960s RCA 6V6GTA tubes in this precisely matched quad have gray plates, bottom D getters, and clear glass. The red print on the bases has the RCA logo. All four tubes test as new for both current draw (mA) and transconductance (Gm).
Tung-Sol 6SN7GT - black glass, round plates, Mullard label
Tung-Sol 6SN7GT - black glass, round plates, Mullard label
Price: $229.00
Tung-Sol 6SN7GT - black glass, round plates, Mullard label
This very rare 1940s military spec Tung-Sol 6SN7GT tube has black glass, round black plates with copper grid posts, and a round mica. The white print on the glass has the Mullard shield logo. Tube tests as new with balanced sections.
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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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