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Old 6th October 2010, 05:57 PM   #1
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Default Dynakit Mark III amplifier

Greetings all,
What is the 390 pf cap from the screen of the KT88 to the pentode of the
6AN8 for? If it's feedback, I thought the 1K/750 pf from the 16 ohm spkr tap did that.

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Old 6th October 2010, 06:42 PM   #2
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It's there to HF balance the two sides of the push-pull to make up for imbalances in though output transformer. The DCR, leakage inductance, and capacitance are different from one half to the other because of the winding geometry.
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Old 6th October 2010, 06:45 PM   #3
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AFAIK it's there to tweak the square wave response of the amplifier by correcting for anomalies produced by the output transformer. And it is feedback.
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