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Old 11-02-2013, 12:44 AM
Pern Pern is offline
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Join Date: Jan 2009
Location: Landskrona, Sweden
Posts: 349
Both the Summing Amp and the EQ Amp are inverting gain stages. The signal is inverted after the Summing Amp and inverted once again after the EQ, this gives the correct phase for the main outputs.

The design is called SRPP and mostly used in Tube Amps, this design can be implemented in a couple of different ways but here it's a fixed bias Transistor + FET design.
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Last edited by Pern : 11-02-2013 at 04:46 AM.
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