12AT7
The 12AT7 is a high-frequency twin triode in a small 9-pin miniature glass package. This tube has a mu factor of 60, as compared to the higher gain 12AX7 with a factor of 100, and the 12AU7, with a mu of only 20. As you can see, it shares similar pin connections with it's cousins, but these tubes are not interchangeable. The 12AT7 is found in many high fidelity applications, as each triode section in normal use operates as a class A amplifier. They also turn up in line and microphone preamplifiers, musical instrument amps, and vacuum tube equipped recording equipment. By their design, they are inherently low noise, making them a good choice for these applications.
 JJ Gold Pin preamp tubes ECC81 12AT7 BRAND NEW  US $24.99
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 2 Siemens ECC81 12AT7 Audio Tubes Tube 52 matched US $20.50
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 Electro Harmonix 12AT7 pre amp tubesGold Pin NEW US $19.99
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 Electro Harmonix 12AT7WC 12AT7 Ultra Low Noise tubeNEW US $17.99
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 JJ Tesla 12AT7 ECC81 preamp tubes NEW US $11.99
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 Philips ECG JAN 12AT7WC ECC81 12AT7 tubesBrand New US $11.49
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 125 NOS USED 12 volt AA5 Tubes 50C5 12AT7 12AU7 35C5 US $41.00
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 Vintage Sylvania preamp 12AX7 12AU7 12AT7 pre amp valve US $5.00
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 1 x Tungsram ECC81 12AT7 tube NOS very strong US $5.00
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 2 Vintage 12AT7 Vacuum Tubes Guitar or JukeBox US $2.95
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 1 Sylvania 12AT7 6679 Tube Tested Black Plates US $14.00
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 Vintage Mullard Eico 12AT7 ECC81 Stereo Tube TK1 B1F US $38.99
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 2 NOS GE JAN 12AT7 WC 6201 Vacuum Tubes NIB US $22.00
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 2x ECC81 12AT7 NOS RFT PREAMP DOUBLE TRIODE VALVE TUBES US $22.50
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 4 x ECC81 12AT7 NOS RFT PREAMP TWIN TRIODE VALVES TUBES US $44.00
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 ECC81 12AT7 Daystrom Mullard Tubes 3 pcs Blackburn US $15.95
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 12AT7 Electro Harmonix Twin Triode 12AT7EH ECC81 US $10.95
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 RCA 1 ea 12AY7 1 ea 12AT7 US $4.99
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 2 NEW PHILIPS 12AT7 WC VACUUM TUBES TUBE ECC81 12AT7W US $27.50
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 NOS Mullard 12AT7 US $5.00
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 ECC81 12AT7 SUPER STRONG NOS RFT MATCHED PAIR US $24.99
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 12AT7 amplifier vacuum tube tested Hallicrafters ECC81 US $9.99
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 1 1960 British Mullard Marconi B309 ECC81 12AT7 tube US $64.95
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 Vintage RCA 12AT7 ECC81 Holland White Stereo Tube RARE US $37.99
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 4 Mixed Brands 12AT7 12AT7WA JAN 12AT7WB Tested US $.99
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 RCA 12AV7 12AT7 Amp Vacuum Tube SQUARE BLACK PLATE US $13.88
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 RCA 12AV7 12AT7 Amp Vacuum Tube BLACK PLATE 1956 US $13.88
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 Sylvania 12AT7 Amp Vacuum Tube BLACK PLATE Red Label US $14.88
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 Sylvania 12AT7 Guitar Amp Vacuum Tube Square Getter US $13.88
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 Radio Vacuum Tubes 12AT7 WC JAN PHILIPS 5 NOS NIB US $29.99
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 3 NOS ECC81 12AT7 BLACK Plates O GETTER US $29.00
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 4 Vintage Telefunken Tubes ECC81 12AT7 Western Germany US $21.50
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 ECC81 12AT7 Telefunken 3 tested All Diamond base US $19.99
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 Three New 12AT7 of Triple Mica By Sylvania US $10.50
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 3 Vintage Amperex Mullard 12AT7 Audio Tubes Blackburn US $36.00
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 1012AX7 12AT7 Valve Tube 9 Pin Retainer HolderT55 US $11.99
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 2 x RCA SYLVANIA ECC81 12AT7 mixed shortplate tubes US $5.99
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 Brand New USA 12AT7 6201 Pre Amplifier Tube 4 pcs US $50.00
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 212AT7 ECC81 TWIN TRIODE TUBES Made In USA 12AT7 US $27.49
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 4 MATCHED ECC81 RFT 12AT7 NOS Tubes PRECISE TEST US $9.99
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 12AT7 Vacuum Tube US $2.99
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 12AT7 ECC81 MAZDA BELVU FRANCE TUBE TESTED US $24.99
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 2 Vintage IEC Mullard 12AT7 ECC81 Stereo Tubes US $56.99
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 GE GL 6201 12AT7WA 12AT7 Amp Vacuum Tube 3 MICA SET1953 US $77.95
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 Vintage IEC Mullard 12AT7 ECC81 Bl Plates Stereo Tube US $29.99
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 5 GE 5965 12AT7 12AV7 radio audio tubes US $9.99
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 Quad Siemens ECC801S 12AT7 ECC81 Germany NIB US $53.75
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 Pair Telefunken ECC81 12AT7 Tubes US $39.95
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 Four 12AT7 Tubes Test Very Strong US $14.95
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 12AT7 MATCHED PAIR GE 6201 MIL SPEC TUBES TESTED ECC81 US $19.99
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 12AT7 ECC81 NIB Rad Tel test strong Tube 01 039 US $25.00
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 12AT7 ECC81 Westinghouse test strong Tube 01 040 US $10.00
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