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RCF AS6001 amplifier schematics needed |
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M4trix 
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Joined: 23 June 2009 Location: Croatia Status: Offline Points: 445 |
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 Topic: RCF AS6001 amplifier schematics neededPosted: 11 April 2017 at 7:56pm |
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Well done @Leco ! As for the transistors, I'm not surprised at all. Fake is written all over them. The logo still boggles me. Never seen it before and I doubt it's from China.
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DjLeco
Young Croc 
Joined: 21 April 2009 Location: Bucharest Status: Offline Points: 817 |
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Posted: 10 April 2017 at 12:47pm |
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Fixed today, thanks for schematic, my friends!
CLONES low cost half output trannies!
Replaced all BC-trannies on both output modules, 4 MJE 340-350 and 2 NE5532, recalibrated bias, all like new! For those ones who will fix this kind of amplifiers in the future, if channel stays in protection mode even ALL components are OK, go on basic control motherboard, and replace 150kOhm resistors R60A and R60B with 82-100kOhm resistors at 3 watts.  It took me 2 days to realize as the prepolarisation current for constant curent generators BF87x was too low (too big value resistor, 150K ) to activate leds, as constant voltage source...
What's inside a clone, compairing to the originals ON Semi... Bull$**t.
[video]https://www.youtube.com/watch?v=Q4CerRqF-XI&feature=youtu.be[/video] Edited by DjLeco - 10 April 2017 at 4:18pm |
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I'm A Stupid SMART Romanian...
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kedwardsleisure
Old Croc 
Joined: 20 January 2009 Location: Staffordshire Status: Offline Points: 4947 |
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Posted: 13 March 2017 at 8:11pm |
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its called work!
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Kevin
North Staffordshire |
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M4trix
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Joined: 23 June 2009 Location: Croatia Status: Offline Points: 445 |
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Posted: 13 March 2017 at 12:07am |
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DjLeco
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Joined: 21 April 2009 Location: Bucharest Status: Offline Points: 817 |
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Posted: 05 March 2017 at 10:04pm |
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The amp has arrived, I will open fake trannies to see and compare with originals.
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I'm A Stupid SMART Romanian...
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M4trix
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Posted: 03 March 2017 at 6:51pm |
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@Kevin,
well, for the sake of science, you could keep one as a souvenir, the other one for the autopsy ! 
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kedwardsleisure
Old Croc
Joined: 20 January 2009 Location: Staffordshire Status: Offline Points: 4947 |
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Posted: 01 March 2017 at 1:09pm |
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A few years. A customer sent an amp in for repair and told me "don't get any transistors for it, I will send some' and he sent those (in CPC packets). Which is why I fitted ON Semi transistors and kept a couple of those as a souvenir.
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Kevin
North Staffordshire |
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M4trix
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Posted: 28 February 2017 at 11:10pm |
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I have never seen such logo. Perhaps made in India ? @Kevin, since when do you have them ? Looks like an old batch.
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DjLeco
Young Croc
Joined: 21 April 2009 Location: Bucharest Status: Offline Points: 817 |
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Posted: 28 February 2017 at 6:57pm |
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Yes, those are very poor clones...
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I'm A Stupid SMART Romanian...
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kedwardsleisure
Old Croc
Joined: 20 January 2009 Location: Staffordshire Status: Offline Points: 4947 |
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Posted: 28 February 2017 at 11:36am |
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Look like these.
This lot were supplied by CPC in the UK. Good amps those Yorkvilles.  Edited by kedwardsleisure - 28 February 2017 at 11:38am |
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Kevin
North Staffordshire |
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DjLeco
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Joined: 21 April 2009 Location: Bucharest Status: Offline Points: 817 |
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Posted: 28 February 2017 at 8:02am |
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I wait first to arrive.
Me too, I'm curous too about the surface of silicon inside those m-FAKE-rs...
 Edited by DjLeco - 28 February 2017 at 8:04am |
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I'm A Stupid SMART Romanian...
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M4trix
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Joined: 23 June 2009 Location: Croatia Status: Offline Points: 445 |
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Posted: 26 February 2017 at 11:23pm |
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No problem.
 Edit: When you have time, open one of those weird marked MJ15022/23. Let's see the sucker inside. Edited by M4trix - 27 February 2017 at 12:41am |
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