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7th January 2006, 05:03 PM
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#1 |
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diyAudio Member
Join Date: Sep 2004
Location: Burnaby B.C. Canada
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Coupling cap. values???
Hello everyone!
Trying to get a handle on the coupling cap. values for the Phase inverter to P-P output tubes. I've looked at Marshall schematics and they are any where from .022uf to .47 uf with .022 and .1 being the majority!! What's the science here?? Thaanx in advance! stew |
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8th January 2006, 04:39 AM
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#2 |
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diyAudio Member
Join Date: Apr 2004
Location: Philly
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Here you go:
http://www.aikenamps.com/Equations.htm All the math you need. The Co in conjunction with the following impedance to ground sets the low freq rolloff. The deeper the bass, the more change of ugly grid blocking (or "farting out" as they call it in the guitar world). So it is a trade off of sufficient bass response and potential blocking.
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