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Old 3rd March 2008, 04:15 AM   #1
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Default Chassis layout help

I'm looking to redo my 2A3 SET chassis. This time I'm thinking 2 separate enclosures for better isolation. I use 105 db horn drivers so low hum or buzz is critical.
Here's the layout.
Click the image to open in full size.

Any suggestions? Thanks.
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Old 3rd March 2008, 04:39 AM   #2
rdf is offline rdf  Canada
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Just thinking out loud...
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File Type: gif new2a3layoutcb9_rec.gif (40.2 KB, 224 views)
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Old 3rd March 2008, 10:08 PM   #3
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rdf, thanks for the input. Question, why not put all the power caps in one chassis?
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Old 3rd March 2008, 10:57 PM   #4
rdf is offline rdf  Canada
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Depending on topology you might want to move both pairs. Placing them on chassis from the audio stages effectively adds 24" (?) of wire in each direction, B+ supply and ground return. That wire adds an order of magnitude or more of inductance and resistance to the cap and scotches two benefits of what appear to be nice oval oils. By keeping that loop tight you're also much less likely to run into high frequency oscillation issues, hum, etc. . The actual placement on the audio chassis was just an aesthetic guess, close is all that counts. If you prefer not to move either consider large, high quality local bypasses right at the audio circuit.

That drawing is the layout planned for an 813SE on my bench, the reason it was ready for suggestion.
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Old 3rd March 2008, 11:52 PM   #5
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Quote:
Originally posted by rdf
what appear to be nice oval oils. By keeping that loop tight you're also much less likely to run into high frequency oscillation issues, hum, etc. .
I see your point. Yes, those are motor run oil caps.
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