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Old 10th October 2021, 08:46 PM   #111
spiggs is offline spiggs  United States
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Quote:
Originally Posted by Francois G View Post
...but instead are trimming R104 to change the bias on Q101. When you decrease the Q101 bias the V101 tube conducts more current and therefore lowering the plate voltage due to a bigger drop across the load resistor R108. Did I get this right?
Correct. All I am doing is playing with trimmer R104 and observing it's influence on the FFT spectrum.
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Old 11th October 2021, 03:32 AM   #112
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Here is the REW plot I am getting at 1W
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Old 12th October 2021, 03:29 PM   #113
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The mains noise that is shown in the REW plot is audible. I have been trying to cleanup the grounding but can still hear a buzz through the speakers. Right now I have a ground from each opt speaker outputs, one from left input to pcb, toroidal ps shield, and mains earth all meeting at one point using clip leads. Any advice on what to try next?
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