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Old 6th November 2009, 06:04 PM   #1
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Default C.E.C AMP3300R (3300 R Amp 3300R Amp3300) and AMP5300R LEF Class A schematic wanted

CEC (C.E.C) claim by their mostly amplifier models, it's class A (here in Germany even "Pure Class A") The name of circuit topology is "LEF (Load Effect Free). The developer is Mr. Carlos Candeias. Have a look to this URLs: Amp 3300R:
CEC AMP3300R
and Amp 5300R (Amp5300R Amp 5300R Amp5300)
CEC EUROPE WEBSITE
The last model delivers 120W/8 ohms and 135W/4 ohms, as to read in the CEC datasheet
If anybody can posted the schematic of one of both models, I will make an evaluation. I guess, the term "Pure Class A" is concerning the pre-driver stage and driver stage of a push pull complementary CFP resp. Sziklai pair, but I don't know this exactly.
If there really pure Class A by the output power devices, where is a heatsink with the appropriate sizes?
Thank you very much for your posted schematics in advance
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Old 6th November 2009, 06:32 PM   #2
BV is offline BV  Slovakia
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Power consumption (acording prospect) 65-450W, so no class A..."Ppure class A" is realy valid only for voltage amplifying stage,not for output stage, as in other "normal" amplifiers.Only marketing talks...
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Old 16th December 2009, 02:45 PM   #3
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are there still no schematics?
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Old 29th March 2010, 03:13 PM   #4
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schematics for this CEC models still needed.
Attached Images
File Type: jpg CEC amp3300i Inside.jpg (57.1 KB, 767 views)
File Type: jpg CEC LEF Amp3300 inside II.jpg (63.3 KB, 731 views)
File Type: jpg CEC LEF AMP3300R INSIDE.JPG (31.2 KB, 715 views)
File Type: jpg CEC LEF IGM.JPG (29.1 KB, 708 views)
Attached Files
File Type: pdf CEC LEF principle.pdf (47.2 KB, 374 views)

Last edited by tiefbassuebertr; 29th March 2010 at 03:26 PM.
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Old 31st March 2010, 02:37 AM   #5
vizion is offline vizion  United States
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I read somewhere the Amp3300 leaves Class A at 10 watts. I don't have schematics though.
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Old 21st September 2010, 06:06 PM   #6
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circuit diagram still needed.
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Old 27th October 2010, 05:00 PM   #7
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are there members, which have one of this amp models in use?
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Old 27th October 2010, 06:04 PM   #8
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Quote:
Originally Posted by tiefbassuebertr View Post
circuit diagram still needed.
I have the feeling that this diagram is only available through reverse engineering of one of the modules. Not sure if they are potted or glued inside that red plastic.

The attached document, otoh, may well describe Nelson's "Stasis" output stage or any other "current dumping" topologies.
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Old 27th October 2010, 07:14 PM   #9
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Quote:
Originally Posted by analog_sa View Post
I have the feeling that this diagram is only available through reverse engineering of one of the modules. Not sure if they are potted or glued inside that red plastic.

The attached document, otoh, may well describe Nelson's "Stasis" output stage or any other "current dumping" topologies.
Yes. Read the statements by post #3 and #5 of our great master about
Cec Amp71
The schematic I need (first to make a cost estimate) for prepare this amp device for connecting of a dual mono outdoor power supply.

Last edited by tiefbassuebertr; 27th October 2010 at 07:16 PM.
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Old 24th November 2010, 05:42 PM   #10
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Are there only a very small amount of pieces of this model and other CEC LEF models in use over the world?
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