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Old 12th June 2012, 05:43 PM   #11
RJM1 is offline RJM1  United States
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Why are the output transistors mounted so far up on the heat sink?
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Old 12th June 2012, 05:52 PM   #12
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well if i understand the question correctly i can tell you that the pcb has drills through and its a dual layer but soldering is made on the top and if the amplifier needs to be serviced for any reason that will happen this way very easily .

Also some manufacturers think of that and make drills and pads and trough's with a bit of tolerance so replacing parts is easy .

For the specific amp all boards can be removed individually for service and without any complicated wiring which means that the designer thought of that also ....
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Old 12th June 2012, 05:54 PM   #13
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If your question has to do with the places of semis on the heatsinks i can tell you that these are placed on the lower half but the heatsink any way is huge and enough for this type of amplifier
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SERVICE ΕΝΙΣΧΥΤΩΝ ΚΑΙ ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr
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Old 12th June 2012, 05:55 PM   #14
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Sakis, how does this compare to the P3A?
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Old 12th June 2012, 06:09 PM   #15
jcx is offline jcx  United States
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Enjoy the output board with all the dirty stuff on it zobel inductor dumper that of course features separated return to 0Volts in order to keep the amplifier's ground as clean is possible
I hope the output current isn't "dirty" - large, yes

I would call AB rail currents that are "half wave rectified" "dirty" - they should be resolved on the power output/power supply connections - the interleaved output devices helps reduce any contaminating magnetic field radiation of these "dirty" currents

but the output wire and loudspeaker return gnd wire should have only the current demanded by the loudspeaker flowing in them - usually not characterized as "dirty" signals - most loudspeakers are only low order moderately "weak" nonlinear loads - the output coils could couple to the inputs so it is worth paying some attention to - but nothing like the evils of the PS rail currents

doing load and signal gnd "right" can be difficult in multichannel amps with shared power supply - "dual mono" is "best", differential amplification referencing the output terminal gnd, "gnd loop breaker" construction can work with less than "perfect" gnds - but lots of copper - applied intelligently in hierarchical gnd schemes can be practical, "good enough"

if you worry about external RF coupling to speaker cables the shown construction isn't particularly great
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Old 12th June 2012, 06:17 PM   #16
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well i haven't finished the repair yet so i cannot tell ... obviously there is a question on how one will put next to each other a 2x60 BJT and CFP amplifier next to a mosfet 2x350W ...it will not be possible

Still my guess is that at low power and casual listening under the same speakers i always use ( near fields/ easy load ) the P3a will be warmer....Obviously i dont like mosfets and especially at class AB

That ... though is my personal opinion and if i had the chance or the money or the load ( proper speakers ) i would definitely get a Perreaux by far from so many i have seen in the market .

Since you are asking i will make a detailed presentation when i am done

Still i feel very privileged to be able to work with such a machine .....

( haven't seen you for a while chlorophile ...good to see you )

Kind regards
sakis
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SERVICE ΕΝΙΣΧΥΤΩΝ ΚΑΙ ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr
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Old 12th June 2012, 06:41 PM   #17
a.wayne is offline a.wayne  United States
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Wait until you touch a Plinus ....
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Old 12th June 2012, 06:54 PM   #18
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ready for that ...no worries when you repair 400-500 amplifiers per year not so many things can actually surprise you ....still though i always keep open options ....

Kind regards
sakis
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Old 12th June 2012, 07:07 PM   #19
a.wayne is offline a.wayne  United States
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Old 12th June 2012, 07:13 PM   #20
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Have you ever worked on a Crown? My Com-tech 400 is laid out very well and only high quality components are used.

Click the image to open in full size.

You might not be able to see this but there are two transformers used in this amplifier. The small one actually doubles as a heat-sensitive fan that turns on when the amplifier gets too hot. My comtechs run so cool though that this hasn't happened yet!

You also cannot forget the grounded bridge technology, large heat sinks, CAD-designed chassis that optimizes airflow across the components, interchangeable PIP cards, ODEP protection, and distortion-sensing technology. I don't mean to rain on your parade, but I believe that there are other contenders for the title of "proper amplifier".
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