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Amp Internals 2
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Peter Jan View Drop Down
Young Croc
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Joined: 16 December 2008
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Points: 1019 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Peter Jan Quote  Post ReplyReply Direct Link To This Post Posted: 25 October 2017 at 2:18pm
Originally posted by Earplug Earplug wrote:

Originally posted by kedwardsleisure kedwardsleisure wrote:

looks a bit older than that. There will be a date code on the capacitor cans I'd have thought.


Aye, could be older. It´s all packaged up and awaiting collection, so not too sure about opening it up to check. I´m quite busy as well, so let´s see how the day goes.    Smile



I have serviced Music-Son from the early eighties till about 2000 and I have never even seen these things come in for service. It can be ~50 years old by the look of the components.
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Earplug View Drop Down
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Points: 7216 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Earplug Quote  Post ReplyReply Direct Link To This Post Posted: 29 October 2017 at 12:31pm
" I have never even seen these things come in for service. It can be ~50 years old by the look of the components."

I´ve had a few of their guitar and bass amps in for service over the years, but never one of these. Musicson definitely have their fan club down here. Many people I know started out on them and have fond memories.  Smile


Anyway - also had a couple of these in for repair:















Chalk and cheese with the Musicson.  LOL


Both PRX amp boards had blown TVS diodes (bottom right in the last photo), although the other also had some other issues. Is that a common problem with these (I mean the TVS)? Just in case, I did replace with higher power devices.




Edited by Earplug - 29 October 2017 at 12:33pm
Earplugs Are For Wimps!
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michel29 View Drop Down
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Points: 55 		Post Options Post Options   Thanks (0) Thanks(0)   Quote michel29 Quote  Post ReplyReply Direct Link To This Post Posted: 06 November 2017 at 7:24pm
blown TVS diode ?
before rectifier ?
on primary DC bus ?

no chemical cap on primary bus , only a MKP cap?

Music-son
pictures of speakers internal ?



Edited by michel29 - 06 November 2017 at 7:31pm
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perf.sound View Drop Down
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Points: 5 		Post Options Post Options   Thanks (0) Thanks(0)   Quote perf.sound Quote  Post ReplyReply Direct Link To This Post Posted: 07 November 2017 at 1:39pm
Peavey PV 2600
https://ibb.co/iZEhdG -
https://ibb.cobUtkw -
https://ibb.co/jY665w -
https://ibb.co/egFzQw -
https://el.imgbb.com/ - upload images
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michel29 View Drop Down
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Joined: 04 November 2014
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Points: 55 		Post Options Post Options   Thanks (0) Thanks(0)   Quote michel29 Quote  Post ReplyReply Direct Link To This Post Posted: 07 November 2017 at 8:45pm
the clone of crest CPX2600
https://forum.speakerplans.com/amp-internals-2_topic44897_page188.html
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kedwardsleisure View Drop Down
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Joined: 20 January 2009
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Points: 4947 		Post Options Post Options   Thanks (0) Thanks(0)   Quote kedwardsleisure Quote  Post ReplyReply Direct Link To This Post Posted: 07 November 2017 at 10:03pm
badge-engineering rather
Kevin

North Staffordshire
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4AC View Drop Down
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Joined: 18 September 2010
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Points: 521 		Post Options Post Options   Thanks (0) Thanks(0)   Quote 4AC Quote  Post ReplyReply Direct Link To This Post Posted: 08 November 2017 at 7:55am
Anyone who can help me identifying this thing? See also this topic: https://forum.speakerplans.com/topic100592_post997529.html#997529
uǝɿɿɐʌǝ6ɯo sı ʇsʞǝʇ ǝzǝp
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simonp1100 View Drop Down
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Points: 1110 		Post Options Post Options   Thanks (0) Thanks(0)   Quote simonp1100 Quote  Post ReplyReply Direct Link To This Post Posted: 08 November 2017 at 5:12pm
Looks like an MC2 clone to me.
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john979 View Drop Down
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Hello from Romania. Does anyone know what power this amplifier has that I found nothing about it on the internet. I only know it is class H, 2 step +/- 50vDC and +/- 100vDC
Thank you!
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kedwardsleisure View Drop Down
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Points: 4947 		Post Options Post Options   Thanks (0) Thanks(0)   Quote kedwardsleisure Quote  Post ReplyReply Direct Link To This Post Posted: 24 November 2017 at 10:20pm
the heatsinks look vaguely RAM
Kevin

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cravings View Drop Down
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Joined: 30 January 2007
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Points: 7442 		Post Options Post Options   Thanks (0) Thanks(0)   Quote cravings Quote  Post ReplyReply Direct Link To This Post Posted: 24 November 2017 at 10:26pm
vmb are from spain? could it be a ram audio oem??
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kedwardsleisure View Drop Down
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Points: 4947 		Post Options Post Options   Thanks (0) Thanks(0)   Quote kedwardsleisure Quote  Post ReplyReply Direct Link To This Post Posted: 24 November 2017 at 11:28pm
the rear sockets also look like a RAM layout. Take the lid screws out, then put them back in again. If the threads immediately strip, its a RAM
Kevin

North Staffordshire
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