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Amp Internals 2

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valve head777 View Drop Down
Old Croc
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Joined: 27 July 2012
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Post Options Post Options   Thanks (0) Thanks(0)   Quote valve head777 Quote  Post ReplyReply Direct Link To This Post Posted: 10 August 2022 at 11:11pm
friend lending me this Aimeek ca80. Apparently 6k. It has 28 output devices per channel and weighs in at 42kilo. I'm using it while my macro tech 5002 goes in for repair. Be interesting to see how it compares. I'll be hanging 2 drivers a side, so 4r. Spec says 2.4k @4r per channel. Will be reggae bass 😉



Edited by valve head777 - 10 August 2022 at 11:17pm
Freedom of choice, choice of freedom.
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valve head777 View Drop Down
Old Croc
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Post Options Post Options   Thanks (0) Thanks(0)   Quote valve head777 Quote  Post ReplyReply Direct Link To This Post Posted: 10 August 2022 at 11:46pm
Freedom of choice, choice of freedom.
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EmPro View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote EmPro Quote  Post ReplyReply Direct Link To This Post Posted: 11 August 2022 at 7:53am
Looks like is capabile to push some current in drivers,let us know how did performed. Smile
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valve head777 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote valve head777 Quote  Post ReplyReply Direct Link To This Post Posted: 04 September 2022 at 10:29pm
Didn't disappoint, bit of a beast. Not completely used in anger, but happy with performance at 4r on a channel. Absolutely no discernible heat. 
Freedom of choice, choice of freedom.
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Earplug View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Earplug Quote  Post ReplyReply Direct Link To This Post Posted: 10 February 2023 at 7:02pm
Just got these beauties in for repair/servicing:-










Funnily enough, one channel on each dead...   Cry









Hopefully nothing too serious, but one had something that would be for the "Spot the deliberate mistake" thread:-






We all know the pressure when the Show Must Get Going and something isn't working - but really, to risk destroying the amp - or starting a fire... Ouch Angry Ouch






Earplugs Are For Wimps!
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kedwardsleisure View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote kedwardsleisure Quote  Post ReplyReply Direct Link To This Post Posted: 08 March 2023 at 12:11pm
Nice old Marshall arrived. Who said Hitachi fets don't fail?

Kevin

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EmPro View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote EmPro Quote  Post ReplyReply Direct Link To This Post Posted: 08 March 2023 at 12:15pm
Originally posted by kedwardsleisure kedwardsleisure wrote:

Nice old Marshall arrived. Who said Hitachi fets don't fail?


Really??? The Hitachi's are dead in this thing? How he managed to? lol
EmPro Audio
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Post Options Post Options   Thanks (0) Thanks(0)   Quote shaun1264 Quote  Post ReplyReply Direct Link To This Post Posted: 12 March 2023 at 8:14pm
Crown DC300A Series II.  Well used.  Original components,  Still running well after all these years. Another one of Crowns Gerald Stanleys designs. Amazing clever early design.   Topology is the patented class AB+B.  The outputs carry no bias.  Outputs are lowish bandidtrh but durable.  The drivers run in class AB.  The outputs act as "boosters" in Class B over a certain wattage.  Very low THD, low DC offset and good power down to DC.

THD at 1Khz into 8 ohm load just before IOC lights show.

Output just before IOC lights show into a 8ohm load


Edited by shaun1264 - 12 March 2023 at 8:16pm
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EmPro View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote EmPro Quote  Post ReplyReply Direct Link To This Post Posted: 12 March 2023 at 8:33pm
This design among with Ground Bridge design are the legends that made Crown a trusted and well reputed PA manufacturer...Thumbs Up

Edited by EmPro - 12 April 2023 at 9:23pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote M4trix Quote  Post ReplyReply Direct Link To This Post Posted: 13 March 2023 at 12:49am
Now imagine those days when you had to populate the board without component markings printed on PCB. Pain in da arse ! LOL
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Post Options Post Options   Thanks (0) Thanks(0)   Quote kedwardsleisure Quote  Post ReplyReply Direct Link To This Post Posted: 13 March 2023 at 8:42am
I doubt they'd be hand built, the auto insertion machine would know where everything went!
Kevin

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4D View Drop Down
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Post Options Post Options   Thanks (1) Thanks(1)   Quote 4D Quote  Post ReplyReply Direct Link To This Post Posted: 13 March 2023 at 7:55pm
Qsc EX4000 





Edited by 4D - 13 March 2023 at 8:01pm
DMZ. "The bass was intense. Girls were literally running up to stand next to the subs"
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