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Amp Internals 2

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jbl_man View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jbl_man Quote  Post ReplyReply Direct Link To This Post Posted: 22 February 2021 at 9:36am
Originally posted by Bams Bams wrote:

Devine MA-800, bought for bass duties in a no-budget system, 2x400@4ohm. based on ttc5200/tta1943 so hard to belive but its only running a beyma 15g300 in a scoop for garden parties so won't be an issue. tried it on my home stereo and was remarkably "warm" sounding so quite a happy camper. 

Devine is the instore brand of BAX shop and their budget gear has a good price/quality comparison. Bought this one for 80 euros' but still sells new for 220 euro. 



Apart from the single fan, looks exactly the same as a Dare DJ900 i bought a few years back.




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Post Options Post Options   Thanks (0) Thanks(0)   Quote kedwardsleisure Quote  Post ReplyReply Direct Link To This Post Posted: 22 February 2021 at 10:33am
and stageline STA-700
Kevin

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Earplug Quote  Post ReplyReply Direct Link To This Post Posted: 22 February 2021 at 2:16pm
And down here, RAM made some that look the same as well. Obviously a common design - with a horrible design fault. 

The RAM one's I've seen have slots above the fan. Cover that and they overheat - and go POP! One company here installed those in a few bars - where it can get really hot anyway. In the end - and after several repairs, I just swapped out for other amps. Really stupid.   Ouch


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Post Options Post Options   Thanks (0) Thanks(0)   Quote full speed Quote  Post ReplyReply Direct Link To This Post Posted: 23 February 2021 at 4:25am
the same as master audio MQA 3100 rated as 2x300 watts in 4 ohm but the transformer is a joke..is only about 180 watts. i replace all the crap caps inside and now is sounding very sweet on 2 inc compression drivers.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jbl_man Quote  Post ReplyReply Direct Link To This Post Posted: 23 February 2021 at 11:53am
And here's the  IMG Stageline version as Kevin mentioned above. Yup,all the same amp.


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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bams Quote  Post ReplyReply Direct Link To This Post Posted: 23 February 2021 at 12:40pm
And now for the one million dollar question.. where originated the design :) 

regarding the design flaw; it will go nicely with my other amps then.. Dynacord PAA's. in which the designers had the radical idea to let air flow from side to side.... 


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Post Options Post Options   Thanks (0) Thanks(0)   Quote APW Quote  Post ReplyReply Direct Link To This Post Posted: 23 February 2021 at 1:31pm

From memory the Dynacord PAA range would draw cold air in at the front and out through the sides... this isn't that uncommon.... Crest used to do this on amongst others the LA, V and VS ranges.



Edited by APW - 23 February 2021 at 1:31pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bams Quote  Post ReplyReply Direct Link To This Post Posted: 23 February 2021 at 5:38pm
Originally posted by APW APW wrote:

From memory the Dynacord PAA range would draw cold air in at the front and out through the sides... this isn't that uncommon.... Crest used to do this on amongst others the LA, V and VS ranges.


I stand corrected.. indeed from front to sides.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote njw Quote  Post ReplyReply Direct Link To This Post Posted: 23 February 2021 at 6:39pm
Originally posted by Earplug Earplug wrote:

And down here, RAM made some that look the same as well. Obviously a common design - with a horrible design fault. 

The RAM one's I've seen have slots above the fan. Cover that and they overheat - and go POP! One company here installed those in a few bars - where it can get really hot anyway. In the end - and after several repairs, I just swapped out for other amps. Really stupid.   Ouch


   

 It's a silly design for a 'pro' amp that's more than likely going to live in a rack IMO, they could've just turned the PCB by 90 degrees and mounted the fan in the front or rear panel (or both!)...?  

 Edit; The Behringer km750 and T Amp e400 appear to use a very similar design; 

TEST AMPLIS T AMP E 400 THOMANN – HiFi-STereo.fr, conception, enceinte  audiophile DIY active, DAC, amplificateur et acoustique

Dentro Al Behringer KM750 - YouTube


Edited by njw - 23 February 2021 at 6:48pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Earplug Quote  Post ReplyReply Direct Link To This Post Posted: 23 February 2021 at 8:06pm
" they could've just turned the PCB by 90 degrees and mounted the fan in the front or rear panel (or both!)...?" 

Yup.

And do those also have slots in the top plate? Or do they rely on air flow from the sides? In any case - a really stupid design.

Someone is always going to put something on top of the amp and block the flow, never mind the obvious danger from spilt liquids, etc. The last amp I'd stick in a bar....   Dead


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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bams Quote  Post ReplyReply Direct Link To This Post Posted: 23 February 2021 at 9:24pm
8 different brands selling an OEM design, with 8 different specifications, and all of them rather optimistic, with the devine pricey compared to other ones .. the wonderfull world of low-end gear always is interesting :)

Edited by Bams - 23 February 2021 at 9:24pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jbl_man Quote  Post ReplyReply Direct Link To This Post Posted: 24 February 2021 at 8:30am
Originally posted by Earplug Earplug wrote:

" they could've just turned the PCB by 90 degrees and mounted the fan in the front or rear panel (or both!)...?" 

Yup.

And do those also have slots in the top plate? Or do they rely on air flow from the sides? In any case - a really stupid design.




Yes,agreed,very odd,given there would have been no additional cost in turning the pcb 90 degrees.

Dare were obviously aware of the overheating issue in fitting two fans to their version.

And here it is yet again, a Biema W220 this time.




Edited by jbl_man - 24 February 2021 at 12:32pm
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