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Old 20th Aug 2013, 6:53 pm   #2
Herald1360
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Join Date: Feb 2007
Location: Leominster, Herefordshire, UK.
Posts: 16,527
Default Re: Roberts R200- Distorted Output

It sounds like you need a bit more volt drop across X3 to get the bias current up a bit. You could try replacing it with a silicon PNP or just a 1N4148 or similar. You will still be able to dc connect the output bases and emitters at the low end of the adjustment range.
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