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nervine line control M3

Following the same philosophy used in our phono preamplifiers, this is a low parts count preamplifier that relies on special shunts for the PSU.
The Jfet differential input provides drive to the Mosfet output directly.
To avoid the need for a VAS we cascoded the output Mosfet so the IPS can drive it directly without the issues normally found due to Miller effect.
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