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6th October 2010, 05:57 PM
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#1 |
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diyAudio Member
Join Date: Oct 2009
Location: Binghamton, NY
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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. Thanks, Ray |
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6th October 2010, 06:42 PM
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#2 |
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diyAudio Moderator
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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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“Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache |
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6th October 2010, 06:45 PM
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#3 |
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diyAudio Member
Join Date: Aug 2006
Location: Taxland, New Jersey
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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.
__________________
"The supercomputer is technologically impossible. It would take all of the water that flows over Niagara Falls to cool the heat generated by the number of vacuum tubes required." ~ Professor of Electrical Engineering, New York University |
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