Noobish qustion - Can you use a doorbell transformer for.....

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Think of them as just low quality 24VAC transformers. You can use one for a preamp, IF you find one that doesn't buzz. It's not unusual for them to buzz or develop a buzz in a few years.

You can't use them for a DC choke for the same reason you can't use a more conventional transformer there either: DC will saturate the core.
 
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