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Amplifiers Rescue Gods
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EmPro View Drop Down
Young Croc
Young Croc
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Joined: 26 June 2020
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Points: 583 		Post Options Post Options   Thanks (0) Thanks(0)   Quote EmPro Quote  Post ReplyReply Direct Link To This Post Posted: 01 October 2023 at 11:54am
Pinyorouk,well....yeah..i'm going to restore this crap to his full glory,i already removed all the bad parts last night,so far i have: 6 outputs blown,10 are good but cannot use them as they are different types Confused,i have blown 4 of the 8 drivers so i can use  2 and 2 to make one driver ch good but i'm not going to use them as i don't trust them Confused i have blown a dozen of resistors all types and power ratings,rectifier diodes and dozen of zenners as well plus a bag of TO92 transistors,also at least 2 capacitors from 10 in the main supply needs to be replaced as they look odd to me LOL and yeah...should work after this....or...exploding again,at least i'll be there to enjoy the show LOL
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Young Croc
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Joined: 26 June 2020
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Points: 583 		Post Options Post Options   Thanks (0) Thanks(0)   Quote EmPro Quote  Post ReplyReply Direct Link To This Post Posted: 01 October 2023 at 11:58am
Originally posted by jbl_man jbl_man wrote:

Wow, yup. you're not wrong there, that one is a mess. Some great soldering skills there to get it that bad. Did he use a hot poker heated in a fire? LOL

You might be able to salvage some of the good output devices and useful bits, so i'm sure it wont be a total loss.

Trust me...i've no ideea why they even try....LOL
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Young Croc
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Joined: 26 June 2020
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Points: 583 		Post Options Post Options   Thanks (0) Thanks(0)   Quote EmPro Quote  Post ReplyReply Direct Link To This Post Posted: 01 October 2023 at 12:00pm
Originally posted by shaun1264 shaun1264 wrote:

Another fine mess by someone who is clueless.  It always amazes me when I see people 'having a go' to fix things. 

Nice little project there which will keep you busy for a few hours


Indeed mate,with all the parts available will take me like 4-5 hrs to have it back on his feet proper made this time Smile


Edited by EmPro - 01 October 2023 at 4:17pm
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Old Croc
Old Croc


Joined: 20 January 2009
Location: Staffordshire
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Points: 4902 		Post Options Post Options   Thanks (0) Thanks(0)   Quote kedwardsleisure Quote  Post ReplyReply Direct Link To This Post Posted: 01 October 2023 at 6:19pm
interesting that they fitted some vintage crown transistors in there! Maybe he had less luck with the macrotech and thought he'd make 1 good from 2 bad.
Kevin

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Young Croc
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Joined: 26 June 2020
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Points: 583 		Post Options Post Options   Thanks (0) Thanks(0)   Quote EmPro Quote  Post ReplyReply Direct Link To This Post Posted: 01 October 2023 at 7:05pm
About those crown transistors...i have one good and one bad LOL i'm going to open them to see the die size Smile and internal.

Edited by EmPro - 01 October 2023 at 7:05pm
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Young Croc
Young Croc


Joined: 31 January 2011
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Points: 538 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Pinyorouk Quote  Post ReplyReply Direct Link To This Post Posted: 01 October 2023 at 7:45pm
I knew you'd repair it SmileTongue
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Young Croc
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Joined: 26 June 2020
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Points: 583 		Post Options Post Options   Thanks (0) Thanks(0)   Quote EmPro Quote  Post ReplyReply Direct Link To This Post Posted: 01 October 2023 at 8:17pm
Unfurtunate for it,will need to wait 3 weeks for the repair as i'm going in a long and well deserved holliday LOL i'll keep you guys posted when i'm done with it,cheers
Also i'm in progress to put my hands on a Mosfet 1000 as well Tongue


Edited by EmPro - 01 October 2023 at 8:17pm
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Young Croc
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Joined: 26 June 2020
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Points: 583 		Post Options Post Options   Thanks (0) Thanks(0)   Quote EmPro Quote  Post ReplyReply Direct Link To This Post Posted: 03 October 2023 at 6:57pm
As i was saying:
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Old Croc
Old Croc


Joined: 03 January 2012
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Points: 7105 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Earplug Quote  Post ReplyReply Direct Link To This Post Posted: 04 October 2023 at 7:07am
So the Crown and 004 are 140V devices. The 025 has a bigger die, as expected.   Smile
Earplugs Are For Wimps!
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Young Croc
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Joined: 26 June 2020
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Points: 583 		Post Options Post Options   Thanks (0) Thanks(0)   Quote EmPro Quote  Post ReplyReply Direct Link To This Post Posted: 04 October 2023 at 10:02am
Originally posted by Earplug Earplug wrote:

So the Crown and 004 are 140V devices. The 025 has a bigger die, as expected.   Smile

Yes,basically the crown and motorola should be the same,but the one motorola made for crown is way better build and stronger leads.
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Joined: 06 September 2013
Location: Surrey
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Points: 260 		Post Options Post Options   Thanks (0) Thanks(0)   Quote shaun1264 Quote  Post ReplyReply Direct Link To This Post Posted: 12 November 2023 at 5:35pm

C Audio RA1001.  Fan seized.  Removed fan, stripped down, lubricate and then fit.  Runs quiet and fine but will need a new fan in the near future as bearing rumbling slightly.  Lateral MOSFET output topology, nice big transformer.  Bass hits hard and tight.  Very smooth midrange treble.  Very good SNR.  Dead silent. 




Edited by shaun1264 - 12 November 2023 at 5:37pm
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Young Croc
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Points: 583 		Post Options Post Options   Thanks (0) Thanks(0)   Quote EmPro Quote  Post ReplyReply Direct Link To This Post Posted: 12 November 2023 at 6:39pm
That's a hell of a transformer for only 8 Hitachi's Big smile sure it sounds good!
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