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GE 6L6GC - precision matched quad
GE 6L6GC - precision matched quad
Price: $239.00
GE 6L6GC - precision matched quad
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).
GM70 - copper plate, matched pairs
GM70 - copper plates, matched pair
Price: $200.00
GM70 - copper plates, matched pair
The military spec GM70 tubes in this precisely matched pair have the highly desirable copper plates. Both tubes have the Russian military OTK insignia. Click "more info" for test results.
RCA 845 - matched pair
RCA 845 - matched pair
Price: $3,000.00
RCA 845 - matched pair
The 1964 RCA 845 tubes in this precisely matched pair (2) have gray plates and bottom D getters. The metal bases have the RCA logo and matching date codes (64-39). Click "more info" for test results.
SED
SED "Winged C" 6550C - matched quad
Price: $224.00
SED "Winged C" 6550C - matched quad
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.
Tung-Sol 5998 - black plates
Price: $179.00
Tung-Sol 5998 - black plates
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.
GE 7044 - premium matched pair
GE 7044 - matched pair
Price: $79.00
GE 7044 - matched pair
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.
Mullard 12AT7 / ECC81 - matched pair
Mullard 12AT7 / ECC81 - matched pair
Price: $104.00
Mullard 12AT7 / ECC81 - matched pair
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.
Mullard 12AX7 / ECC83 - matched pair, phono grade
Mullard 12AX7 / ECC83 - matched pair, Philips logo, phono grade
Price: $229.00
Mullard 12AX7 / ECC83 - matched pair, Philips logo, phono grade
The 1976 Mullard ECC83 / 12AX7 tubes in this precisely matched pair have halo getters and short gray plates (I63 series). The white label has the Philips logo and the Blackburn, UK factory code is etched in the glass. Both tubes test as new
National Union 6SL7GT - black glass, matched pair
National Union 6SL7GT - black glass, matched pair
Price: $109.00
National Union 6SL7GT - black glass, matched pair
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.
Philips 6V6GT - brown base, matched pair
Philips 6V6GT - brown base, matched pair
Price: $109.00
Philips 6V6GT - brown base, matched pair
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.
Russian 6Π14Π-EB / 6P14P-EV / 6BQ5 - matched quad
Russian 6P14P-EV / 6Π14Π-EB / 6BQ5 - matched quad
Price: $129.00
Russian 6P14P-EV / 6Π14Π-EB / 6BQ5 - matched quad
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.
Sylvania 12AX7WA - long gray plates
Sylvania 12AX7WA - long gray plates, matched pair
Price: $119.00
Sylvania 12AX7WA - long gray plates, matched pair
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
Tung-Sol 12AY7 - gray plates
Tung-Sol 12AY7 - gray plates
Price: $69.00
Tung-Sol 12AY7 - gray plates
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.
Westinghouse 6V6GTA - 7591 style plates
Westinghouse 6V6GTA - 7591 style plates
Price: $39.00
Westinghouse 6V6GTA - 7591 style plates
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.
Amperex PQ 6922 / E88CC - gold pins
Amperex PQ 6922 / E88CC - gold pins, phono grade
Price: $119.00
Amperex PQ 6922 / E88CC - gold pins, phono grade
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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