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Started by SemiConductive, April 05, 2022, 05:28:56 PM
Quote from: Enzo on April 10, 2022, 03:54:24 PMI stand corrected.
Quote from: SemiConductive on April 10, 2022, 02:47:27 PMUpdate on the hands-on side: Successful test!I lifted the diodes from ground and put a toggle in there so I could do back-to-back testing. The diodes were definitely clipping at fairly low signal levels... as soon as the gain pot was set to above minimal. By disconnecting them with the switch, I can get a lot more clean headroom, which is what my goal is for this amp... and as expected. Turning on the "overdrive" switch in the panel and bringing IC1-B into play bumps the volume fairly cleanly. But with that on and the gain turned up high you still get into distortion territory, again as expected. There is a little bit of a treble cut when you switch on IC1-B, even at low levels where it stays very clean. Very slight cut, just taking off the upper edge a little. Not unpleasant but a minor change. Perhaps the resistors and caps hanging above IC1-B are doing some filtering when it's on? Or maybe it's the opposite... there's filtering when the signal runs fully through the resistors/caps above with IC1-B shut off and turning it on eliminates that? I'm a little confused by the fact that the caps appear to be "in-line" (not going to ground) and I would think they'd filter bass, if anything, in that configuration.