6SL7
The 6SL7 is a high-mu twin triode in an octal based glass package. To my knowledge, there were not any metal shell versions made. Each triode section operates as a class-A amplifier. This tube has much higher mu than it's cousin, the 6SN7. It's factor is 70, whereas the 6SN7 is only 20, therefore these two tubes are not interchangeable. There is still a good population of hi-fi and musical instrument amps using this tube in the preamp stage out there, and these tubes are still available. The 6SL7 was never as popular as the 6SN7---due to the 6SN7's widespread use in television chassis design---so this tube does not turn up as often whenever vintage tubes are being sold. It is, in the proper circuit, a wonderful sounding tube, and audiophiles would do well to try the NOS vintage 6SL7 tubes before buying anything currently made today.
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6N9S 6SL7 Russian Double Triode Tubes in box Lot of 8 | US $16.00 | 
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AudioTek - Shuguang 6N9P 6SL7 TWIN TRIODE TUBE - 2PCS | US $4.25 |
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NOS Match Pair Super RARE Sweden 33S29B for ECC35 6SL7 | US $30.00 |
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6N9S METAL BASE TUBES MATCHED PAIR NOS 50's made / 6SL7 | US $39.99 |
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6SL7 = 6SL7GT = 6N9S. Lot of 4 NEW! BOXED! | US $9.00 |
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Pair 2 GE 5691 6SL7 stereo amp tubes Hickok tested | US $22.50 |
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GE - 6SL7 GT - Radio Tube - new in box | US $9.99 |
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6SL7GT 6SL7 GT Slyvania Tube - NOS? | US $29.99 |
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TUNGSOL TUNG-SOL REISSUE MATCHED 6SL7 GT UPGRADE - 2PCS | US $1.99 |
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Pair Vintage Amplifier Tubes 6SL7 GT Good | US $9.99 |
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PAIR VINTAGE RCA RED BASE 5691 6SL7 AMPLIFIER TUBE | US $55.00 |
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1 NOS RCA JAN CRC 5691 Vacuum Tube - 1951 RED BASE 6SL7 | US $12.50 |
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VINTAGE NOS VACUUM TUBE SYLVANIA 6SL7GT 6SL7 GT | US $4.99 |
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FOUR NOS GE SILVER PLATE 6SL7 AMPLIFIER TUBE | US $25.00 |
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Ampeg Reverberocket R-12-R Tube Set RCA 6V6 6SN7 6SL7 | US $125.00 |
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Tube boxes for 6V6/6SN7/5881/ 7591/7355/6BX7/6SL7 | US $3.50 |
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Radio Tubes 6SL7 12AT7 6V6 6SK7 35C5 6SK7 12SQ7 6SA7 11 | US $.99 |
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Matched Pair RCA 6SL7 6SL7GT Tubes -- NOS Testing | US $44.00 |
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GE USA Gibson GA-6 Tube Set 6V6GTA 12AY7 6SL7 5Y3GT | US $79.00 |
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VINTAGE G.E. 6SL7 RADIO,AUDIO TUBE,IN BOX,TESTED | US $9.99 |
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