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Old 24th July 2003, 02:37 PM   #1
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Join Date: May 2002
Default Gainclone Impedance

I have a passive preamp already which is best when matched to a power amp with >50k impedance. What is the impedance of a gainclone and can it be raised to >50k if necessary?

Your advice would be much appreciated
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Old 24th July 2003, 04:15 PM   #2
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Location: Cascais
Yes it can. But not very suitable in the 'inverted' mode which many prefer soundwise. In the standard non-inverting mode there are absolutely no problems. In the inverting mode a 50k input resistance means at least 1mohm fb resistor for a minimum gain of x20 and 1.5Mohm for a more conventional gain of x30. No idea how stable the offset will be. Of course there will be slightly more noise as well. You're in a bit of a 'catch 22' situation here.

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