There was a tremendous advantage to the Loctals that I don't think any manufacturer really explored: compared to an equivalent octal, the parasitic capacitance between the various electrodes was much smaller. I think the reason for this is obvious however; much smaller 7 and 9 pin miniatures came along that were even better in this regard. Still, in the handful of sets that used an octal triode for the local oscillator, the equivalent loctal tube would have likely been more stable at higher frequencies.
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