Final test: Module Leco vs Crown Powertech Series Amplifier - diyAudio
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Old 22nd March 2011, 09:51 PM   #1
DjLeco is offline DjLeco  Romania
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Default Final test: Module Leco vs Crown Powertech Series Amplifier

I decided to make an comparative test between mine AB class module amplifier vs. Crown Powertech Series Amplifier.

Dropping power supply to around +/- 77Vdc, to achieve around 500 Watts on mine module.
Both receiving same signal at inputs,both with 4 ohm dummy load on outputs , both calibrated for same tension on output at 1000Hz, means both are equal output power for 1000Hz, so input controller knob, adjust equally both amplifiers, any difference could very easy observablle, so any difference between them are shown.

To mentionate, Crown amplifier is with patented IOC Led (Input output Comparator) wich monitors any distortion , equally or greater than 0.05%, in entire amplifier bandthwidth

http://crownaudio.com/pdf/amps/iocpaper.pdf

WAITING FOR COMMENTS.


Click the image to open in full size.

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Calibrated probes:
Click the image to open in full size.


Leco AB Module vs Crown Powertech Series Intro

YouTube - Leco AB Module vs Crown Powertech Series Intro.MOV

3,3Hz Sin
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3,3Hz Tri
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3,3Hz Sqr
Click the image to open in full size.

30 Hz sinusoidal, max output
YouTube - Leco vs Crown Part 1.MOV

5Hz-30Hz sinusoidal, triangular, squarewave
YouTube - Leco vs Crown Part 2.MOV

30Hz-20Khz-8Hz, sinusoidal, triangular, squarewave
YouTube - Leco vs Crown Part 3.MOV

Dummy loadresistors
http://www.youtube.com/watch?v=M7vOAmCH3Pk

And here some tests with module equipped witg 5 paris of 2SA 2SA Toshiba's output devices , supplied at +/- 100Vdc

8Hz Sin
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8Hz Sqr
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30Hz Sin
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30Hz Sqr
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100Hz Sin
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100Hz Sqr
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1000Hz Sin
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1000Hz Sqr
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10000Hz Sin
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10000Hz Sqr
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20000Hz Sin
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20000Hz Sqr
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100000Hz Sin
Click the image to open in full size.

Dummy load cooling down.
YouTube - Rezistenta la racire



If anyone could calculate Slew Rate of mine module, regarding pictures above at, supplied at +/- 100Vdc, will be very appreciate!

Also any comment will be appreciate too!
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Old 17th June 2013, 12:06 AM   #2
HENDI is offline HENDI  Indonesia
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Join Date: Jan 2013
Default plish share layout pcb

Quote:
Originally Posted by DjLeco View Post
I decided to make an comparative test between mine AB class module amplifier vs. Crown Powertech Series Amplifier.

Dropping power supply to around +/- 77Vdc, to achieve around 500 Watts on mine module.
Both receiving same signal at inputs,both with 4 ohm dummy load on outputs , both calibrated for same tension on output at 1000Hz, means both are equal output power for 1000Hz, so input controller knob, adjust equally both amplifiers, any difference could very easy observablle, so any difference between them are shown.

To mentionate, Crown amplifier is with patented IOC Led (Input output Comparator) wich monitors any distortion , equally or greater than 0.05%, in entire amplifier bandthwidth

Crown Audio - Professional Sound Amplifier Systems Worldwide

WAITING FOR COMMENTS.


Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.



Calibrated probes:
Click the image to open in full size.


Leco AB Module vs Crown Powertech Series Intro

YouTube - Leco AB Module vs Crown Powertech Series Intro.MOV

3,3Hz Sin
Click the image to open in full size.

3,3Hz Tri
Click the image to open in full size.

3,3Hz Sqr
Click the image to open in full size.

30 Hz sinusoidal, max output
YouTube - Leco vs Crown Part 1.MOV

5Hz-30Hz sinusoidal, triangular, squarewave
YouTube - Leco vs Crown Part 2.MOV

30Hz-20Khz-8Hz, sinusoidal, triangular, squarewave
YouTube - Leco vs Crown Part 3.MOV

Dummy loadresistors
Rezistentele.MOV - YouTube

And here some tests with module equipped witg 5 paris of 2SA 2SA Toshiba's output devices , supplied at +/- 100Vdc

8Hz Sin
Click the image to open in full size.

8Hz Sqr
Click the image to open in full size.

30Hz Sin
Click the image to open in full size.

30Hz Sqr
Click the image to open in full size.

100Hz Sin
Click the image to open in full size.

100Hz Sqr
Click the image to open in full size.

1000Hz Sin
Click the image to open in full size.

1000Hz Sqr
Click the image to open in full size.

10000Hz Sin
Click the image to open in full size.

10000Hz Sqr
Click the image to open in full size.

20000Hz Sin
Click the image to open in full size.

20000Hz Sqr
Click the image to open in full size.

100000Hz Sin
Click the image to open in full size.

Dummy load cooling down.
YouTube - Rezistenta la racire



If anyone could calculate Slew Rate of mine module, regarding pictures above at, supplied at +/- 100Vdc, will be very appreciate!

Also any comment will be appreciate too!
  Reply With Quote
Old 29th October 2013, 09:34 PM   #3
black is offline black  Romania
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Leco amplifier 1000 w /4 ohms
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Old 29th October 2013, 10:44 PM   #4
DjLeco is offline DjLeco  Romania
diyAudio Member
 
Join Date: Oct 2006
Location: Bucharest, Romania
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W8 to see you results, on dummy load.

Also I want to see tests for 10Khz squarewave, and surely, damping factor for your clone!

Good luck, soon I will present, version 2 of Leco amplifier, with some surprises!
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