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Old 1st March 2012, 08:01 AM   #831
a.wayne is offline a.wayne  United States
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JBL post up pics of that beast (xa) .......
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Old 1st March 2012, 08:24 AM   #832
JBL4435 is offline JBL4435  Germany
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Quote:
Originally Posted by a.wayne View Post
JBL post up pics of that beast (xa) .......
Could find only these. It's a modded Hifi2000 enclosure.

Off to work....
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Old 1st March 2012, 09:03 AM   #833
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Any ideas whether the Hifi2000 5U cases (400 mm depth) are sufficient to house a V3 ?

Can't find dissipation figures anywhere...
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Old 1st March 2012, 10:12 AM   #834
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On the modushop Website you will find the heatsinks as individual item and they have the dissipation information. If I'm not mistaken it is 0.3w/c per heatsink and each side has two of those.
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Old 1st March 2012, 10:21 AM   #835
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Thanks.

Modello: Profile 200 X 40 H 165 mm
Used for the 4U enclosure 400mm deep temperature coefficient 0,38 C°/W

2 are used per side, so 0,38/2 = 0.19 C/W (assuming perfect heat transfer between the two heatsinks)
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Old 1st March 2012, 10:39 AM   #836
MB500 is offline MB500  Sweden
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Have a look at their download section. You'll find a comp.
of all their enclosures.
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Old 1st March 2012, 10:43 AM   #837
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Modushop mentions 0.28C/W for 2 heatsinks lined up (210mm length) , sounds a little optimistic.
Placing two heatsinks side to side drops efficiency, so a single heatsink would have to do lower than 0.56C/W

For 25C above ambient, i wouldn't try to get more than 150W from a 5U case.

Fischer SK47 (non-corrected for lower temperature operation), baseplate is a few mm thicker than the Modushop one=>
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Old 1st March 2012, 12:30 PM   #838
a.wayne is offline a.wayne  United States
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Originally Posted by JBL4435 View Post
Could find only these. It's a modded Hifi2000 enclosure.

Off to work....
JBL , Those sinks look kinda small for 100w+ of class-a
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Old 1st March 2012, 12:39 PM   #839
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Quote:
Originally Posted by rdk845 View Post
hurdles, ?
Depends how the 200W Class A is defined, peak value or continuous.
Leaving Class A at 200W peak translates to 500 Watts dissipation, for 200W continuous it would be around 700, per channel.

Without access to a heatsink that's optimised for some 100W dissipation each, at a ballpark figure height of some 10 inches, a natural convection monaural will become pretty voluptuous (aka Fat Betty).

A source for affordable big can electrolytics with >100V rating (125V surge) would be a big help.

Frankly, i have trouble to understand why anyone would be willing to spend so many dollars on such an amp design.
An X600 in X1000 dress, with lower rails and higher bias level, is more elegant, more to the point for such an expenditure (and you'll have more backup during the build).
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Old 1st March 2012, 08:18 PM   #840
JBL4435 is offline JBL4435  Germany
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JBL , Those sinks look kinda small for 100w+ of class-a
Good joke

Dissipation is 260W per channel and I measure app. 45°C.
Don't know how you claculate but these mono chassis (4 of these heatsinks) have 0.07 K/W

Last edited by JBL4435; 1st March 2012 at 08:26 PM.
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