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Old 16th November 2013, 04:55 PM   #2351
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Quote:
Originally Posted by AndrewT View Post
The difference in density of the hotter coolant cf. the cooler coolant creates a pressure difference. That pressure difference promotes the flow.

It's the same when an open fire heats the air in a chimney. The chimney draws cooler air into the open fire and vents the hotter air out of the near vertical stack.

The critical part is the requirement for a near vertical stack of warmer coolant. That is what promotes the flow.
Yep.... I used to live in a house with a fireplace chimney that was four stories high. When I opened the flue damper, I'd get a RIVER of cold air streaming down the chimney. Fixed the problem, by "priming" the chimney with a small 120 VAC heat gun (think "very strong hair dryer"). Problem solved, once I got the thermal rise in the chimney...and it was a log better than getting a room of smoke.....!
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Old 16th November 2013, 05:27 PM   #2352
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Originally Posted by CanAm Man View Post
Minor point.....would that be "by gravity", or by convective flow due to the delta T of the water?
Andrew explained it well.
Higher delta T, gives more pressure difference, and higher flow rate.
So it fits well to class A amps: everything has to be big.
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Old 30th November 2013, 10:01 AM   #2353
xLoff is online now xLoff  Europe
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Default F5Turbo-X build

I have finally completed my F5Turbo-X build. Special thanks to Nelson Pass and all forum members supporting and inspiring DIYes out there!

-- xLoff
Attached Images
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Old 30th November 2013, 10:06 AM   #2354
Zen Mod is offline Zen Mod  Serbia
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nice

next time - put those Donuts one on top of the other , and you'll have place for cap banks , also put one on top of the other

or - using big additional plate , you can put both Donuts right behind front plate , "vertically"
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Old 30th November 2013, 10:38 AM   #2355
emyeuoi is offline emyeuoi  Italy
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Really well done xLoff!

Bravo

Enrico
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Old 30th November 2013, 11:12 AM   #2356
bcmbob is offline bcmbob  United States
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Xloff, That last picture prompts me to ask what you are using for volume control. Does what looks like a CD player have that function? I could easily be reading more into that shot than you intended.
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Old 30th November 2013, 12:26 PM   #2357
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A power amp doesn't need a volume control. That function is normally performed by the pre-amp.
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Old 30th November 2013, 01:07 PM   #2358
xLoff is online now xLoff  Europe
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Hi ZM and emyeuoi,

Thanks for the feedback.

Quote:
next time - put those Donuts one on top of the other , and you'll have place for cap banks , also put one on top of the other
or - using big additional plate , you can put both Donuts right behind front plate , "vertically"
- This was the original plan, but I was afraid the amp wold be too heavy at the front, possibly tipping over with ~70% of its 25 kilos at the front... I did follow your tip about hiding the AC mains leads though (link).


Quote:
Xloff, That last picture prompts me to ask what you are using for volume control. Does what looks like a CD player have that function? I could easily be reading more into that shot than you intended
- Hi bcmbob. It's an Audiolab 8200 CDQ preamp with DAC (ESS 9018) and optional CD drive. One of the few decent preamp - DAC combos with analog inputs I could find.

-- xLoff
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Old 30th November 2013, 02:13 PM   #2359
bcmbob is offline bcmbob  United States
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Quote:
Originally Posted by KatieandDad View Post
A power amp doesn't need a volume control. That function is normally performed by the pre-amp.
Quite correct, but a playback system usually does.

xLoff - Very nice combo unit. I have about the same functionality in what happens before the F5/BA-3 but spread across several boxes. As stated in the linked review, the sound shaping and control options are virtually endless - particularly with the 8200 PC union.

Very nice system indeed
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Old 30th November 2013, 07:39 PM   #2360
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Originally Posted by xLoff View Post
I have finally completed my F5Turbo-X build. Special thanks to Nelson Pass and all forum members supporting and inspiring DIYes out there!

-- xLoff
Thank you for sharing the pictures.
Very nice built!

Please be so kind to share also some key specs (Trafo VA, I-Bias, Rail-V, Offset-V, Type of Mosfets, ...).
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