Balanced line stage

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Hi, i had just finished my low tim amp (The Leach amp 2x120w 8ohm's, power amp), and
want to build this balanced line stage.

My 1st quistion is - My power amp, has an input impedance about 20kohm, would this be fine, with the line stage ?

My 2. quistion is - does anyone know, if you can use the IRF630, and IRF 9630, instead of the 610 and 9610.

Hope someone can answer my quistion thanks.
 
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This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.