Re: Interstage Audio coupling transformer
Hi Chris,
It's working as an auto-transformer giving a 2:1 audio-signal step-up ratio, but it also provides a DC path for the bias voltage to get from the GB-battery to the valve-grid.
There were various different ways of doing transformer/choke-coupling over the years, must admit I've not come across it being done the way you describe but I can understand the logic of it.
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