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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.
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 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.
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 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%)
Telefunken 12AX7 / ECC83 - ribbed plates, phono grade
Telefunken 12AX7 / ECC83 - ribbed plates, phono grade
Price: $169.00
Telefunken 12AX7 / ECC83 - ribbed plates, phono grade
This 1958 Telefunken ECC83 / 12AX7 has long ribbed plates and a halo getter. The white label on the glass has the Telefunken logo in excellent condition. The diamond imprint on the base. Tube tests as new with phono/V1 grade noise levels.
Westinghouse 7591A - matched quad
Westinghouse 7591 - matched quad
Price: $319.00
Westinghouse 7591 - matched quad
The 1966 Westinhouse 7591 tubes in this precisely matched quad have gray plates and halo and side getters. The yellow print on the base has the Westinghouse logo. All 4 tubes test as new and are matched for both current draw (mA) and Gm.
Amperex PQ 6922 / E88CC - gold pins, phono grade
Amperex PQ 6922 / E88CC - gold pins, phono grade
Price: $119.00
Amperex PQ 6922 / E88CC - gold pins, phono grade
This 1966 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.
RCA Command Series 5814A / 12AU7 - matched pair
RCA 5814A / 12AU7 - Command Series, matched pair
Price: $109.00
RCA 5814A / 12AU7 - Command Series, matched pair
The 1967-69 RCA 5814A / 12AU7 tubes in this precisely matched pair are labeled for the broadcast quality RCA Command Series. They have black plates and halo getters. Both tubes test as new and are matched for both current draw (mA) and Gm.
RCA 5751 / 12AX7 - black plates, triple mica, matched pair
RCA 5751 / 12AX7 - black plates, triple mica, matched pair
Price: $179.00
RCA 5751 / 12AX7 - black plates, triple mica, matched pair
The 1955 RCA 5751 tubes in this precisely matched pair are a lower gain 12AX7 tube type. They have black plates and triple micas. The white labels on the glass have the RCA logo. Both tubes test as new with balanced sections and low noise.
ElectroHarmonix 6H30Pi - gold pins
ElectroHarmonix 6H30Pi - gold pins
Price: $33.00
ElectroHarmonix 6H30Pi - gold pins
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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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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