I wouldn't use it for larger triodes though. With both sections wired in parallel to halve the plate resistance this can work well and offer the possibility to build a simple two stage amplifier.
#Signal path in 6sn7 driver
The 6SL7 has also been used as driver tube for small triodes like the 45 or 71A. As it does for example in my Octal Preamplifier Mk1. Correctly implemented the 6SL7 gives a nice warm and smooth sound. For example as first stage in a phono preamplifier. If the circuit is designed for it's parameters it is a great performer and it works well in unison with the 6SN7. This high plate resistance which comes with a rather low transconductance probably is the reason why it lost popularity a bit when higher transconductance tubes became more fashionable. For complete technical data please see the data sheet. It also operates at a lower current, typically around 2ma. The 6SL7 has a plate resistance of 44kOhms which is more than 6 times higher than the rp of the 6SN7. But that high amplification factor comes at a cost. As mentioned above it is a high mu triode with an amplification factor of 70 vs the 20 of the 6SN7.
The heater operates at the same 6.3V as the 6SN7 but at only half the current (300mA).
While the 6SL7 might work in some circuits designed for the 6SN7 and provide a bit higher gain, it really is a different animal and should only be used in circuits which are designed for it. To some tube rollers this made it seem compatible and it was often tried as an alternative to get more gain. It shares the same octal base and pinout with the 6SN7.
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