Pre-amp, driver valves Octal, 8-pin

Here we have the 8 pin input, phase splitter valves such as the 6SN7, 6J5 and 6SL7.

6SL7 double triode
A high-mu twin triode used in resistance coupled circuits.
6SN7 double triode
A medium-mu twin triode used in resistance coupled circuits.

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