[ARC5] Receiver audio impedance

[AKLDGUY]

My ARA 6-9.1 Mc receiver has an audio output transformer of the original
type which I want to terminate correctly and feed to a solid state
amplifier. What is the correct termination?

Apparently the ARA and AN/ARC-5 sets were 300-600 ohm headphone impedance,
but how can I be sure an SCR-274N transformer (4,000 ohm) hasn't been
fitted. All transformers were stamped 5634 weren't they?

Neil ZL1ANM
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