Just checking to be sure that 36 π (pi) should be 36 Ω
(omega) on page 29 of the 740 Extra Features Manual.
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If that's so, then:
--the manual needs correcting: Change pi to omega, or write out "Ohms."
--and I need assurance that the 740's audio output impedance really is 36 Ohms. (36 Ohms seems an unusual impedance for an audio output circuit.)