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Amp Internals 2

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Miles View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Miles Quote  Post ReplyReply Direct Link To This Post Posted: 07 February 2017 at 7:31pm
Dynacord ST 2200 - 2x200watts - 20kg -  approx. built in the late 1970's still going strong...





Edited by Miles - 07 February 2017 at 7:33pm
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bcs View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bcs Quote  Post ReplyReply Direct Link To This Post Posted: 17 February 2017 at 10:58am
crest cks

Edited by bcs - 17 February 2017 at 11:00am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bcs Quote  Post ReplyReply Direct Link To This Post Posted: 17 February 2017 at 2:38pm
sorry above pics on a crest I recently bought.
 
mike


Edited by bcs - 17 February 2017 at 2:38pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote M4trix Quote  Post ReplyReply Direct Link To This Post Posted: 18 February 2017 at 12:12am
Philips capacitors. Probably the last batch made in Holland before Philips moved to China. Big smile
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Post Options Post Options   Thanks (0) Thanks(0)   Quote njw Quote  Post ReplyReply Direct Link To This Post Posted: 18 February 2017 at 10:12pm
Originally posted by Miles Miles wrote:

Dynacord ST 2200 - 2x200watts - 20kg -  approx. built in the late 1970's still going strong...



 

 All that for 400w (on paperWink)! Gotta love old school amps!Big smile
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jbl_man Quote  Post ReplyReply Direct Link To This Post Posted: 18 February 2017 at 11:12pm
Lovely old thing. Each TO3 has got its own heatsink if you look closely. Thumbs Up
Be seeing you.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote fossil Quote  Post ReplyReply Direct Link To This Post Posted: 21 March 2017 at 12:36pm
For a man who's just discovered your collective secret that the exclusively ugly appearance of PA amps hides such stunning and beautiful internals, this forum is a wet dream. Fave so far is page 106 - the output inductors (Zobel network?) on the Crown XTi 6000 - surely not!!!! I am building my first ever amp based on the LM1875 chip and I strayed across this forum - at first I didn't quite believe my eyes. Words are just not enough. You have have to be congratulated on creating an absolute masterpiece! Praise, praise and more praise to you all. 
 
   
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Post Options Post Options   Thanks (0) Thanks(0)   Quote KingGwarn Quote  Post ReplyReply Direct Link To This Post Posted: 21 March 2017 at 1:12pm
Not my photos...saw em on a Facebook post...but King Jammy's original bass amp!

"Was out for mantainance in a workshop in Kingston. Engineer said 8k and UK custom built."




Soundman inna Brighton town
King Gwarn Sound System
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coolboarder View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote coolboarder Quote  Post ReplyReply Direct Link To This Post Posted: 21 March 2017 at 1:32pm

Here comes an austin armstrong amp.
Does anybody know about austin armstrong amps ?
It showed fault on the front panel. I replaced 2 resistors (the relatively big, skin color ones on the last picture).
The fault was gone, but after a while it goes in fault mode again at medium levels. Is this the right place to discuss ?
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 - - -
 
Thank you,
Fabian


Edited by coolboarder - 21 March 2017 at 1:36pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote freddymendez Quote  Post ReplyReply Direct Link To This Post Posted: 21 March 2017 at 1:47pm
Fabian, you may get more of a response by starting a new topic in the Amp Forum. Regards
120-140 bpm, pianos and bass.
diesel, the fuel of professionals.
mendez/manchester
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Post Options Post Options   Thanks (0) Thanks(0)   Quote simonp1100 Quote  Post ReplyReply Direct Link To This Post Posted: 21 March 2017 at 2:10pm
Ahh, I smell C-Audio design.LOLLOL.
 
If you have changed some of the FET's then the bias current will need re-adjusting, also the last picture does show one or two resistors brown (check these).
 
Simon
 
 
 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote coolboarder Quote  Post ReplyReply Direct Link To This Post Posted: 21 March 2017 at 2:19pm
Thank you guys. I will start a new topic in the amp forum
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