The CS 300F may look classically conventional, but this all-valve design uses some distinctly non-standard toobs. Where most designs (including Leben’s own CS 300X(S) model) might use something like two pairs of EL84s as power output tubes to achieve its modest-yet-meaty 15W per channel, the CS 300F uses two pairs of JAN 6197/6CL6 valves made by General Electric. This power pentode valve from 1954 was a dual-use design; although it was made to be used as a Class A amplifier valve, its primary use was in early digital computers, as it was designed to be robust enough to survive being switched between full operation and cut-off.
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