OEP Z21805C - Mic input transformer - Any good?

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> going through the supply rails?

I bet these are the "offset" pins. They are also inputs, but hardly any common-mode range (the '2546s handle that).
 
  They changed the collector resistors from the 12k inside the 5534 with 1k8 (1k6 counting the 12k in parallel), so I would expect about 7.5x the bias current on those input transistors relative to the internals. That's one way to get away with low turns ratio transformer...

JS
 
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