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Frank, a question about the FetValve input stage

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tonyptony

Frank, a question about the FetValve input stage
« on: 21 Oct 2011, 09:44 pm »
Hi Frank. When a FetValve amp is powered off, does the input appear as an open-circuit to the preamp, or does it measure as some sort of load? If the latter, is it complex or mostly resistive?
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Tom Alverson

Re: Frank, a question about the FetValve input stage
« Reply #1 on: 22 Oct 2011, 12:08 am »
Since the input stage is a tube, it doesn't matter if the amp is on or off.  The input impedance is set by a resistor, probably around 500K.
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tonyptony

Re: Frank, a question about the FetValve input stage
« Reply #2 on: 22 Oct 2011, 07:29 pm »
Thanks Tom. I wasn't sure if there was anything significant in front of the tube.
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