LSC Feedback shorted?

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Stretto

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Jan 7, 2011
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I'm trying to diagnose my amp. I noticed that with the "feedback resistor" disconnected it reads 100Ohms across the point. On the schematic there doesn't show any parallel resistance(hence it should read infinity). Is there a short somewhere or is the schematic missing some information(I'm using the commonly available schematic)?
 
What you're metering there is the rest of the loop - the resistance of the OT secondary winding, to ground, and back up through the feedback 'tail' resistor of the phase inverter. I don't have the LSC schematic, but since the OT secondary resistance is typically under 1 ohm and 100 is a standard value for the resistor in that position, I'm guessing that it's correct. Check the value of the tail resistor though.

Do you have the schematic in a form you could email me? PM me if you do, thanks!
 

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