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Old 11th September 2011, 05:59 AM   #11
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Join Date: Feb 2010
Quote:
artosalo, out of interest did you have matched output tube idle currents, or better still were you able to check output hum levels whilst you varied idle current mismatch?
There is bias adjustment for each output tube and idle currents were set identical ( about 50 mA).
I did not test the effect of current mismatch. The global negative feedback was 16 dB.
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