[sdiy] tape loops, nagra tape machine erase head hack / AKA dummy load

[Ken Stone]

Quite often the erase head is used as the inductor in the bias oscillator,
so as such it is essential. The only thing I would replace it with is
another identical erase head. That way your circuitry should keep funtioning
correctly


>I'm having trouble disabling my nagra erase head.  After disconnecting the
>erase head I've tried dummy resister loads between 10meg and 1k, but the
>recorded sound volume rolls off far quicker than it should.  By the
>second repeat, the sound is gone.  If I put tape over the erase head
>and re-enable the erase head then we're in good shape.
>
>Do I need an inductive dummy load and if so, how do you calculate such a
>thing?
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Ken Stone   sasami at hotkey.net.au or sasami at cgs.synth.net
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